I suppose that there might be a remote chance that your command station has "flaky electronics" which manifasts itself like somoethgin that can be contributed to electrical connectivity between the command station and the decoder, but it suer looks to most of use with soem DCC or electical experience like connetivity problem.
Is there any chance you coudl take your DCC system to your friend and temproarily hook it up to just prgrammign track? If his command station works flawlessly and yours in that environment is still flaky then that woudl prove that it is your command station causing problems.
I dislike the Digitrax system (but I'm stuck dealing with the one my NTRAK club uses) and I would wholeheartedly recommend trying another brand. I own an NCE Power Cab, and it is so much easier and simpler to deal with than Digitrax. Perfect for testing models (which is what I used it for, just like you), or for a small layout.