Both my R1100RT and now my R1200GS have had the same problem with two different Zumo 550 mounts. Both have been bar mounted and make all kinds of motion related static on the audio output through the Autocom. I've tried dielectric grease at the pins connection, buisness card between the mount and zumo and now I have tried folded up post it notes at different places to make the darn thing work. It just seems loose in the mount causing static and loss of power at times when I hit rough road. Sometimes I can hold onto the zumo in the mount and keep it working nice and clear, but then comes the next red light. Has anyone else had this problem? Garmin is next to worthless on this issue. I wish that they had used a plug style connection or some way of adjusting the unit to the mount.