Why ESP32 Bluetooth crash?

I have esp32 wroom 32 module,
I am using esp32 bluetooth for sending and receiving data(esp32 to android). network.
but the problem is some time the bluetooth connection is lost ,after that the bluetooth in module is not visible.
while reconnecting the supply voltage of esp32,the bluetooth is visible.
why this happens?

3.3V supply not powerful enough?
no clue

.

Add some debug print outs from the ESP-module, telling what it has been doing. Maybe it is stuck waiting for something that the code does not handle.