Iphone 14 plus signal drops + won't come back

Hello, my son's iphone 14 plus has an infuriating problem.

He has a physical sim card for a Belgian carrier. When he enters Belgium his signal nornally works but then if it drops for whatever reason (in a train, car, cellar) it doesn't come back.

We have to remove the sim, put it in another phone and then put it back in the iphone.

Is this a known issue? Does anyone have any smart fixes?

(we have tried network resets and the sim works on other phones, including my old android brick)

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Iphone 14 plus signal drops + won't come back
 
 
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