Welcome to Android Central! Can you show us a screenshot of that when it happens? https://forums.androidcentral.com/threads/guide-how-to-post-screenshots-on-android-central.413366/
I'll try that. Thanks.Sometimes just clearing the phone app cache for a glitch like this is not enough I would try clearing data then force stop the phone app
Thank you for explaining that and including the link. I'll try that next.Did you also try Safe Mode, as suggested by mustang7757? If it goes away in Safe Mode, that would indicate that some app you installed is causing the problem. https://www.samsung.com/us/support/answer/ANS00062983/
Do use any 3rd party screen protector or magnetic Case?Good morning. I've been using the phone in safe mode and it's doing the same thing-changing to the phone keypad screen every few minutes. Is there anything else I can try?