Loss of communication by GSM

Hello
I used wp7502 + legato 20.04
I am seeing problems with the module.

Loss of communication by GSM
on 10 minuts
on 20 minuts
on 30 minuts

then the module is completely rebooted.

Tell me, what could be the reasons for this behavior?

do you see this problem in some official FW with Mangoh board?

E.g.
https://source.sierrawireless.com/resources/airprime/software/wpx5xx/wpx5xx-firmware-latest-release/#sthash.tsKKJjQP.dpbs

the board mangoh is not suitable for checking
i can’t check it

why it is not suitable for checking the network related issue?