Why am I losing connection to mobile network

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A

Android Central Question

Happens on Zenfone Max Pro M1 (6/64GB version).
At work, we are asked to lock our mobiles in the lockers. Before that, I have good signal and everything works fine. After my mobile is locked in the locker (ie no signal, most likely) for a few hours, I am unable to receive any calls/messages. If I restart it, I instantly receive all the failed calls (if any) received and all messages received during the time it was locked without signal.
What seems to work is the wifi connection, though. The wifi doesn't seem to have any issues, and it connect immediately as it has a signal. Any way to fix this?
Thanks.