I'm certainly no 4DTV expert as I have recently, and almost reluctantly, rescued my first unit (920) from dumpster fate. The video output was messed up, the menus were whacked-out and there was no remote, but with a little fooling around, a master reset and some universal remote programming, it started to work.
I went to G1 to load the maps and after making the rounds for FTA channels, I figured what the heck, let's try A2. Worst that could happen is another master reset or the originally expected pre-rescue outcome. It's slaved off another receiver anyway. No problems. I've been going back and forth, and while I haven't left it on A2 overnight, it's sat there turned on for several hours at a time. Maybe I'm just lucky, or maybe the channel maps aren't as large as they used to be.
Not to hijack the thread too much, but since this might be related to my misbehaviors, is it possible to receive Lyngsat's transponder 19 DC2 channels on M5? Does the 920 not recognize the FEC? I get the DC2 light on channel 19, but with the maps I have loaded, I can't find a channel that maps to any on Lyngsat's list (Elgourmet, etc.).