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@Koalagirl Have you installed some 3rd party theme or screensaver? Can you check if the same occurs in safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Hi @Koalagirl,
As @alexdon suggested you can try to reboot your device to safe mode to see if this behavior is caused by one of your downloaded apps.
Also if you have developer options activated I'd recommend that you try and disable them. You can do this by going to: Settings > Developer options > Off. If you can't find the developer options under settings they are already disabled. Is the phone still behaving the same way?
Let me know how it goes!