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Can you try to boot in safe mode and check if the same occurs?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Hi Marjii,
Welcome to the community,
Generally this can be related to the SIM card, I would suggest removing it and then testing a friend or family members to see if the issue continues, if not then you will likely need to replace the SIM card.
Let us know how you get on.