iPhone 11 alerts get randomly loud
Ever since I upgraded to the iPhone 11, my alerts get randomly loud for no reason. I have sound adjustment turned off of the side buttons, so no reason for them to all of a sudden get super loud and then go quiet again randomly. Anyone have any ideas? I'm thinking hardware issue but don't want to go to Apple right now to have it checked out. Doesn't happen all the time, but scares the crap out of me when it does.
iPhone 11, iOS 14