Xperia Z3 SIM Card Detection Issue: Possible Damaged Slot or Connection - Restart Required

Hello, I have such a problem with xperia z3 does not see the sim card even though it is inserted but when I start the phone again suddenly the sim card is found and after some time not specified because it works 2 days and once after an hour you need to reset the phone.

Could this be a damaged SIM card slot?

Have you checked how the phone behaves after inserting other cards?

That's what I did at the very beginning, before I started the topic, it reacts the same to every card

Has a software update been made?

Check the correctness of the imei number * # 06 #

If you crash null it hurts your hardware.
A professional hand will heal.

That's how the update was done - and that's why he can't see this card.
I downloaded the flashtool and firmware before the upgrade, I downloaded and it works
I accidentally made sure that this update was guilty because after the first installation of this old firmware I accidentally allowed it to update and the problem reappeared.
I have installed the old firmware again and it works and now I will not allow any system updates.
In case anyone has questions, I don't close the topic

Thank you for answering my question and for your help