I’ve had my Samsung Galaxy Tab A7 for over 4 months. Less than an hour ago, with no input by me, no changed settings, etc., it started beeping (single beep) each time I press one of the volume adjustment buttons on the side (except when the volume is muted). It NEVER did this before. I have checked all sound settings and they have no effect. What in the world happened and how do I stop this? Thank you!