Yes it's a little annoying when the signal is low and drops out AVB.

These days there are a few ways to check that problem and possibly fix it.

Look up your closest phone tower and see what frequencies it transmits and make sure the type of
mobile you have uses the same frequencies as these frequencies are updated from time to time.

Cellular Signal Boosters are another item worth looking at with a weak signal.

https://au.pcmag.com/mobile-phones/85508/how-to-improve-mobile-signal-strength

Cheers
Max.