It has been happening since i first connected to a wifi when i bought this phone. I think it's corrupted by a virus. What do i do? Pls help. I can send screenshots if you need.
Welcome to Android Central! SystemUI is a system app, so that can't be a virus. I can't be sure that is isn't a virus, but that would seem unusual. Malwarebytes is usually good, but any antivirus app can bring up false positives. Does the phone otherwise act strangely?
If you want to be sure, then back up your important data and do a factory reset.