FC21 - stops working after multiple reboots

We have an FC21 module with BT connected via UART. After multiple reboots of the host SoC we lose connection with the module. Our current idea is that the FC21 has gotten out of sync with the host and needs to be reset. How can we do that? Would toggling the BT_EN line work?

hi @CliveDavies
FC21 don’t have reset pin, BT_EN cannot reset the module, it only can be rest BT function.
if the customer want to reset the module , they can power down the VIO and VBAT,There is no reset pin.