Ringtone problem

Hi guys, hoping for some help here. Not sure if it's just my opt, but I can't find anything from search on my problem. I can change my ringtone in sound settings, but 10 min later it's right back to the stock ringtone and notification sound (oneplus tune and free). Is anyone else experiencing this problem or know how to fix it? I'll try any ideas you guys can come up with. I would like to avoid resetting the phone if possible, unless it's a last resort.

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