Had the same problem with a 334ci mounted at the console. It would come on while setting in the garage. If it stayed on too long before I caught it, it sometimes screwed up the whole thing to where I had to reboot the unit. I recently moved it from the console to the front deck and installed a new HB 898si at the console. The HB doesn't turn itself on and the 334 hasn't come on since it's been moved. Poltergeists maybe?