I've had three different 25 Ultras at this point(Samsung replaced the first one, while I was waiting for the replacement I bought one at Best Buy). This replacement device from Samsung has now been completely rebuilt with fresh internal hardware by their service team and I am STILL having this issue.
Cache has been cleared, hard resets have been done, it happens with or without a case on. I'm at a loss. Seems like it could be an app or account issue? Anyone have theories, I'm willing to test anything at this point because obviously something I'm doing is the problem and Samsung over the phone or in their Experience Store have not been helpful (but haven't been bad to deal with, despite not fixing my problems, lol). I am using Smart Switch only for my contacts, no apps or customization.
@Hypochic I would suspect that you are loading a malicious 3rd party app on your phone. The odds of having 3 phones act the same way are extremely slim.
I've been in to a Samsung Experience store and I've had it examined by techs for a mail in: no apps have been flagged (and I've done experiementing with clearing cache and it doesn't help either). Last chat with Samsung Support has reccommended I get an appointment with a technician so that will be tomorrow.
Last factory reset lasted me 4.5 days before the flicker>restart>repeat>launch in SafeMode SystemUI. It's very frustrating! I haven't transferred any data from previous devices. No one has been able to tell me what's wrong 😞 I just want a functional phone
