So I have been running a Kenwood DDX370 for about a year now with zero issues. However, recently my unit has been periodically changing the inputs on its own. For example, if I am playing it on my iPod/Pandora/Radio it will sometimes switch to USB on its own without me touching anything. Originally I thought it might have been an issue with my USB cord or iPhone, but this can also occur when using ONLY the aux input or while playing the radio with nothing hooked up. This only occurs when I have the unit playing at my maximum listening level, 28/35. What could be the culprit causing this? Again, it doesn't happen all the time, only periodically. But sometimes it will happen over and over again.
EDIT - The deck is properly grounded, that's a non issue.