And here I thought I was the only person who thought that factory resets were a hassle. So many people casually recommend them for the slightest problem with a phone or tablet.

Is the phone new or old? If it's fairly new I'd take it to the store where you got it or try online tech support from the manufacturer to see if they can help you troubleshoot. If it's old, you might need to do the reset.

You might also want to install and run the Malwarebytes app or something similar to check for bad viruses, etc.