Unexpected LTE connection drops


We are experiencing an issue with LTE connection using QUECTEL Mobile Broadband Module. After router reboot or administrative interface reset connection works properly. Signal strength reported as excellent and there are no any problems with usage for time period of ~6-8 hours. But after this time period interface comes down and does not reconnect again.

Some technical info:
Router model - Mikrotik RBM11G
Router firmware - mt7621L version 7.3.1
LTE Module - QUECTEL Mobile Broadband Modul
Revision - EC25EUGAR06A05M4G

If you need some additional info or logs please provide us instructions how to collect it properly.