You're welcome!
So it sounds like something recent has caused this [annoying] problem. Can you recall any new apps you installed around the time it started? Take a look at your
app history (which should show newest first) and see if that jogs your memory.
What you can try is uninstalling, in reverse order of how you installed them, any apps that may be the culprit. One by one see if that fixes it. (And if you zero in on the guilty app, please post its name here, and post on its Play Store page, explaining what it did. These will help others.)
Since the problem started several months after a factory reset, I agree with
@ocnbrze that that may be your next step. I know it's a hassle, but if it fixes the problem, it's worth it. Be sure to save any important files before factory resetting.