diff --git a/components/bt/common/btc/core/btc_task.c b/components/bt/common/btc/core/btc_task.c
index bd70ec6db..4ac156555 100644
--- a/components/bt/common/btc/core/btc_task.c
+++ b/components/bt/common/btc/core/btc_task.c
@@ -166,7 +166,7 @@ static bt_status_t btc_task_post(btc_msg_t *msg, uint32_t timeout)
 
     memcpy(lmsg, msg, sizeof(btc_msg_t));
 
-    if (osi_thread_post(btc_thread, btc_thread_handler, lmsg, 2, timeout) == false) {
+    if (osi_thread_post(btc_thread, btc_thread_handler, lmsg, 0, timeout) == false) {
         return BT_STATUS_BUSY;
     }
 
@@ -359,7 +359,7 @@ void btc_deinit(void)
 
 bool btc_check_queue_is_congest(void)
 {
-    if (osi_thread_queue_wait_size(btc_thread, 2) >= BT_QUEUE_CONGEST_SIZE) {
+    if (osi_thread_queue_wait_size(btc_thread, 0) >= BT_QUEUE_CONGEST_SIZE) {
         return true;
     }
 
diff --git a/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c b/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c
index 1a65fbbdc..9ef243231 100644
--- a/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c
+++ b/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c
@@ -182,7 +182,7 @@ static bool btc_a2dp_sink_ctrl_post(uint32_t sig, void *param)
     evt->sig = sig;
     evt->param = param;
 
-    return osi_thread_post(a2dp_sink_local_param.btc_aa_snk_task_hdl,  btc_a2dp_sink_ctrl_handler, evt, 0, OSI_THREAD_MAX_TIMEOUT);
+    return osi_thread_post(a2dp_sink_local_param.btc_aa_snk_task_hdl,  btc_a2dp_sink_ctrl_handler, evt, 1, OSI_THREAD_MAX_TIMEOUT);
 }
 
 static void btc_a2dp_sink_ctrl_handler(void *arg)
@@ -322,7 +322,7 @@ void btc_a2dp_sink_on_suspended(tBTA_AV_SUSPEND *p_av)
 
 static void btc_a2dp_sink_data_post(void)
 {
-    osi_thread_post(a2dp_sink_local_param.btc_aa_snk_task_hdl, btc_a2dp_sink_data_ready, NULL, 1, OSI_THREAD_MAX_TIMEOUT);
+    osi_thread_post(a2dp_sink_local_param.btc_aa_snk_task_hdl, btc_a2dp_sink_data_ready, NULL, 2, OSI_THREAD_MAX_TIMEOUT);
 }
 
 /*******************************************************************************
diff --git a/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c b/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c
index 7f1ef366b..aff552113 100644
--- a/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c
+++ b/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c
@@ -249,7 +249,7 @@ static bool btc_a2dp_source_ctrl_post(uint32_t sig, void *param)
     evt->sig = sig;
     evt->param = param;
 
-    return osi_thread_post(a2dp_source_local_param.btc_aa_src_task_hdl, btc_a2dp_source_ctrl_handler, evt, 0, OSI_THREAD_MAX_TIMEOUT);
+    return osi_thread_post(a2dp_source_local_param.btc_aa_src_task_hdl, btc_a2dp_source_ctrl_handler, evt, 1, OSI_THREAD_MAX_TIMEOUT);
 }
 
 static void btc_a2dp_source_ctrl_handler(void *arg)
@@ -421,7 +421,7 @@ void btc_a2dp_source_on_suspended(tBTA_AV_SUSPEND *p_av)
 
 static void btc_a2dp_source_data_post(void)
 {
-    osi_thread_post(a2dp_source_local_param.btc_aa_src_task_hdl, btc_a2dp_source_handle_timer, NULL, 1, OSI_THREAD_MAX_TIMEOUT);
+    osi_thread_post(a2dp_source_local_param.btc_aa_src_task_hdl, btc_a2dp_source_handle_timer, NULL, 2, OSI_THREAD_MAX_TIMEOUT);
 }
 
 static UINT64 time_now_us()
diff --git a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_av.c b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_av.c
index 8c2c59924..17c2edbb3 100644
--- a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_av.c
+++ b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_av.c
@@ -69,8 +69,7 @@ void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param)
 
 void bt_app_a2d_data_cb(const uint8_t *data, uint32_t len)
 {
-    size_t bytes_written;
-    i2s_write(0, data, len, &bytes_written, portMAX_DELAY);
+    write_ringbuf(data, len);
     if (++s_pkt_cnt % 100 == 0) {
         ESP_LOGI(BT_AV_TAG, "Audio packet count %u", s_pkt_cnt);
     }
@@ -134,8 +133,10 @@ static void bt_av_hdl_a2d_evt(uint16_t event, void *p_param)
              s_a2d_conn_state_str[a2d->conn_stat.state], bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
         if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
             esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
+            bt_i2s_task_shut_down();
         } else if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_CONNECTED){
             esp_bt_gap_set_scan_mode(ESP_BT_NON_CONNECTABLE, ESP_BT_NON_DISCOVERABLE);
+            bt_i2s_task_start_up();
         }
         break;
     }
diff --git a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.c b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.c
index cd9aa99d5..a46c60050 100644
--- a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.c
+++ b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.c
@@ -16,6 +16,8 @@
 #include "freertos/task.h"
 #include "esp_log.h"
 #include "bt_app_core.h"
+#include "driver/i2s.h"
+#include "freertos/ringbuf.h"
 
 static void bt_app_task_handler(void *arg);
 static bool bt_app_send_msg(bt_app_msg_t *msg);
@@ -23,6 +25,8 @@ static void bt_app_work_dispatched(bt_app_msg_t *msg);
 
 static xQueueHandle s_bt_app_task_queue = NULL;
 static xTaskHandle s_bt_app_task_handle = NULL;
+static xTaskHandle s_bt_i2s_task_handle = NULL;
+static RingbufHandle_t ringbuf_i2s = NULL;;
 
 bool bt_app_work_dispatch(bt_app_cb_t p_cback, uint16_t event, void *p_params, int param_len, bt_app_copy_cb_t p_copy_cback)
 {
@@ -111,3 +115,50 @@ void bt_app_task_shut_down(void)
         s_bt_app_task_queue = NULL;
     }
 }
+
+static void bt_i2s_task_handler(void *arg)
+{
+    uint8_t *data = NULL;
+    size_t item_size = 0;
+    size_t bytes_written = 0;
+
+    for (;;) {
+        data = (uint8_t *)xRingbufferReceive(ringbuf_i2s, &item_size, (portTickType)portMAX_DELAY);
+        if (item_size != 0){
+            i2s_write(0, data, item_size, &bytes_written, portMAX_DELAY);
+            vRingbufferReturnItem(ringbuf_i2s,(void *)data);
+        }
+    }
+}
+
+void bt_i2s_task_start_up(void)
+{
+    ringbuf_i2s = xRingbufferCreate(8 * 1024, RINGBUF_TYPE_BYTEBUF);
+    if(ringbuf_i2s == NULL){
+        return;
+    }
+
+    xTaskCreate(bt_i2s_task_handler, "BtI2ST", 1024, NULL, configMAX_PRIORITIES - 3, &s_bt_i2s_task_handle);
+    return;
+}
+
+void bt_i2s_task_shut_down(void)
+{
+    if (s_bt_i2s_task_handle) {
+        vTaskDelete(s_bt_i2s_task_handle);
+        s_bt_i2s_task_handle = NULL;
+    }
+
+    vRingbufferDelete(ringbuf_i2s);
+    ringbuf_i2s = NULL;
+}
+
+size_t write_ringbuf(const uint8_t *data, size_t size)
+{
+    BaseType_t done = xRingbufferSend(ringbuf_i2s, (void *)data, size, (portTickType)portMAX_DELAY);
+    if(done){
+        return size;
+    } else {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.h b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.h
index 4415058a7..eaa390de9 100644
--- a/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.h
+++ b/examples/bluetooth/bluedroid/classic_bt/a2dp_sink/main/bt_app_core.h
@@ -44,4 +44,10 @@ void bt_app_task_start_up(void);
 
 void bt_app_task_shut_down(void);
 
+void bt_i2s_task_start_up(void);
+
+void bt_i2s_task_shut_down(void);
+
+size_t write_ringbuf(const uint8_t *data, size_t size);
+
 #endif /* __BT_APP_CORE_H__ */
diff --git a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_av.c b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_av.c
index 8c2c59924..17c2edbb3 100644
--- a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_av.c
+++ b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_av.c
@@ -69,8 +69,7 @@ void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param)
 
 void bt_app_a2d_data_cb(const uint8_t *data, uint32_t len)
 {
-    size_t bytes_written;
-    i2s_write(0, data, len, &bytes_written, portMAX_DELAY);
+    write_ringbuf(data, len);
     if (++s_pkt_cnt % 100 == 0) {
         ESP_LOGI(BT_AV_TAG, "Audio packet count %u", s_pkt_cnt);
     }
@@ -134,8 +133,10 @@ static void bt_av_hdl_a2d_evt(uint16_t event, void *p_param)
              s_a2d_conn_state_str[a2d->conn_stat.state], bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
         if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
             esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
+            bt_i2s_task_shut_down();
         } else if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_CONNECTED){
             esp_bt_gap_set_scan_mode(ESP_BT_NON_CONNECTABLE, ESP_BT_NON_DISCOVERABLE);
+            bt_i2s_task_start_up();
         }
         break;
     }
diff --git a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.c b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.c
index cd9aa99d5..a46c60050 100644
--- a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.c
+++ b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.c
@@ -16,6 +16,8 @@
 #include "freertos/task.h"
 #include "esp_log.h"
 #include "bt_app_core.h"
+#include "driver/i2s.h"
+#include "freertos/ringbuf.h"
 
 static void bt_app_task_handler(void *arg);
 static bool bt_app_send_msg(bt_app_msg_t *msg);
@@ -23,6 +25,8 @@ static void bt_app_work_dispatched(bt_app_msg_t *msg);
 
 static xQueueHandle s_bt_app_task_queue = NULL;
 static xTaskHandle s_bt_app_task_handle = NULL;
+static xTaskHandle s_bt_i2s_task_handle = NULL;
+static RingbufHandle_t ringbuf_i2s = NULL;;
 
 bool bt_app_work_dispatch(bt_app_cb_t p_cback, uint16_t event, void *p_params, int param_len, bt_app_copy_cb_t p_copy_cback)
 {
@@ -111,3 +115,50 @@ void bt_app_task_shut_down(void)
         s_bt_app_task_queue = NULL;
     }
 }
+
+static void bt_i2s_task_handler(void *arg)
+{
+    uint8_t *data = NULL;
+    size_t item_size = 0;
+    size_t bytes_written = 0;
+
+    for (;;) {
+        data = (uint8_t *)xRingbufferReceive(ringbuf_i2s, &item_size, (portTickType)portMAX_DELAY);
+        if (item_size != 0){
+            i2s_write(0, data, item_size, &bytes_written, portMAX_DELAY);
+            vRingbufferReturnItem(ringbuf_i2s,(void *)data);
+        }
+    }
+}
+
+void bt_i2s_task_start_up(void)
+{
+    ringbuf_i2s = xRingbufferCreate(8 * 1024, RINGBUF_TYPE_BYTEBUF);
+    if(ringbuf_i2s == NULL){
+        return;
+    }
+
+    xTaskCreate(bt_i2s_task_handler, "BtI2ST", 1024, NULL, configMAX_PRIORITIES - 3, &s_bt_i2s_task_handle);
+    return;
+}
+
+void bt_i2s_task_shut_down(void)
+{
+    if (s_bt_i2s_task_handle) {
+        vTaskDelete(s_bt_i2s_task_handle);
+        s_bt_i2s_task_handle = NULL;
+    }
+
+    vRingbufferDelete(ringbuf_i2s);
+    ringbuf_i2s = NULL;
+}
+
+size_t write_ringbuf(const uint8_t *data, size_t size)
+{
+    BaseType_t done = xRingbufferSend(ringbuf_i2s, (void *)data, size, (portTickType)portMAX_DELAY);
+    if(done){
+        return size;
+    } else {
+        return 0;
+    }
+}
\ No newline at end of file
diff --git a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.h b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.h
index 4415058a7..eaa390de9 100644
--- a/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.h
+++ b/examples/bluetooth/bluedroid/coex/a2dp_gatts_coex/main/bt_app_core.h
@@ -44,4 +44,10 @@ void bt_app_task_start_up(void);
 
 void bt_app_task_shut_down(void);
 
+void bt_i2s_task_start_up(void);
+
+void bt_i2s_task_shut_down(void);
+
+size_t write_ringbuf(const uint8_t *data, size_t size);
+
 #endif /* __BT_APP_CORE_H__ */