I have my attitude mounted on dash just above cigarette lighter, was charging cell phone and monitor froze. shut truck off restarted and screen was stuck on "edge products" moved phone away from monitor, alls well. tried it aqain monitor froze, didnt freeze immediately but did freeze. also noticed a little noise from the monitors warning speaker. Also get the same noise if I leave my cell phone too close to my alarm clock. Just a bit of info on my experiences, anyone else have this happen?