I just spoke with Keith in Tech Support at AI. They have certainly gotten the message that a bunch of us are having this same problem with the units.
Per Keith, they have install a bunch of these in Los Angeles for the local Hummer Dealerships, and have called around inquiring if they dealers are seeing this issue. So far no reports of problems.
A.I. thinks there may be a problem with the last batch of 1500 of these units, and they are investigating and trying to solve the issue. Will await their response.
I have disconnected my unit, as electrical malfunctions in a modern automabile may not always be an insignificant nuisance. I am also worried that a bad ipod unit could permanently damage another electrical component in the car.
Even with the unit disconnected, I just noticed that my XM display shows the full song title, but only the FIRST LETTER of the artists name. Per Keith at A.I., the XM may need a "reset" which he said occurs automatically every few weeks, or can be done via request to XM.
