My phone (Xiaomi Redmi Note 10, Android 11) spontaneously disconnects from the mobile internet after being connected for a couple of hours, and it **won't** automatically reconnect. Can stay unconnected for however long. After I switch to the flight mode and back, it reconnects for some time, then loses connection again.

Is there any way to **diagnose** what is the problem? Maybe to find some **logs** from the network hardware.

I thought this might be due to a defective SIM card because the same problem happened to the phone it was previously installed in, but I had SIM card reissued at a mobile operator's office. The same problem is there with the new SIM card. What's the chance it's defective again? ¯\\\_(ツ)_/¯