Stock radio's Aux Input resetting to radio

My 2011 aveo5 has a VERY frustrating issue. When I use the aux input with my cellphone, the system will randomly switch to radio. Sometimes I only get about 1 second of aux input before it moves over to the radio again. Once it "sticks" I'm good for a few days until it starts to reset itself again.

This problem is worse, since I have to put the volume up to about 90% to hear anything from my cellphone, whereas the radio is comfortable at 50%. When it switches to radio, it's insanely loud.

Is this a problem with just me, should I get it checked before my bumper to bumper warranty is up? Or is this just a fault of the stock radio, and I'd be better off spending a few bucks getting a new radio.