Hello, I live in Lithuania. After updating it, the phone immediately started heating up. I factory reset it, and even before setting up the phone on the first boot, the phone heated up. It stopped being hot when I put the Power saving mode on with the "Limit apps and home screen". The next morning I turned off power saving mode and it stopped heating up. I worry that if I reboot it, it's going to do it again. I want to go back to previous version. What should I do? Thank you.