After the latest update, my video calls kept reconnecting every few minutes, the other side couldn't see me. I tried to uninstall and reinstall the app, turned off and on camera permission, nothing works. Oh, and when I tried to change the theme, it kept getting back to the default one. I switched to use another video call app, and it doesn't have those connection problem you have. I like Telegram. I don't wanna stop using it, but I need to see my loved one face through video calls.