So since having the one ui3 upgrade (android 11)... I can't change my theme, my font keeps going funny, I can't use contact less pay its honestly so annoying plus! My battery is drained without me even using it, when I go to download or update anything it comes up with this error code and then another error code comes up saying not enough space or theres another one that says the connection for the download has been lost so I then restart my phone and I have to do this everytine I want to download something. I've also done a factory reset aswell which hasn't made a blind bit of difference if I new this update was gonna be a absolute shitshow I defo wouldn't of done it, if anyone has any tips or anything it would be much appreciated ♡