Camera app not working and SIM signal often interupted after update

I recorded a video a while ago and the app froze, which also froze the frame of the video, but it recorded ~20 of a still image until I forcefully shut down. After that it froze again after a while and then it stopped working completely. Now I only have a black screen with no camera interface when I use the app, but an alternative camera app still works, although it seems like 0.6x zoom is not recognized.

The other issue right after the update was that I was unable to use my SIM for 12h. After rebooting several time it would still that there’s no signal and sometimes even fail to detect the SIM card. It happens rarely now, but sometimes it shows a full signal, but still not be able to connect. Recently after a reboot it didn’t get any signal again, until I did a second reboot.

Anything I can do here?

No camera issue but I have sim problem as well lately. It’s very annoying.