Problem Xiaomi Redmi Note 7 remains without signal


For about 2 weeks, I open the phone and see that it disconnects from the network. It's not just mobile data that drops, it appears as if no SIM is inserted. Most of the time, it is solved with a restart. During this time, the WiFi works without problems.

It's annoying that I have the opportunity to miss calls.

Has anyone else run into this? Do you have any solution?

LE: I see that it is also solved if I remove and reinsert the SIM. Is it worth going to the operator to ask for the replacement of the SIM?