WP7702 Reboot on low radio signal

Hello, got a WP7702 on a mangoH board. We use socket connection to send data (round 1 position info each 2 seconds), and it works perfectly when network coverage is strong. When same module have low network coverage we observe random reboot during transmission. Can you help us investigate the reason of reboot?
In cm info we read:

Device: WP7702
IMEI: 352653090194176
FSN: 4L931388970810
Firmware Version: SWI9X06Y_02.36.06.00 63d944 jenkins 2020/12/10 19:12:28
Bootloader Version: SWI9X06Y_02.36.06.00 63d944 jenkins 2020/12/10 19:12:28
MCU Version: 002.015
PRI Part Number (PN): 9909138
PRI Revision: 001.001
Carrier PRI Name: GENERIC
Carrier PRI Revision: 001.071_001
SKU: 1104405
Last Reset Cause: Power Down
Resets Count: Expected: 324 Unexpected: 0
so reboot seem to be expected. Usually it happen on 2G networks.

I’ve logs on console, see attached pdf, but i cant understand the reason of reboot.
console.pdf (60.3 KB)
console2.pdf (41.5 KB)

Thanks in advance.

Maybe not enough current supply