LSS my HR44/700 developed an occasional lag and some freezing. The lags got longer and worse over time. After a truck roll and some debugging we unplugged the USB of the AM21 and the HR44 started working fine again. Turns out all the techs at DTV and with the truck tech company don’t even know what an AM21 is. More research (here at DBStalk) shows they’re making a replacement to the Am21. I just wanted anyone researching a slow HR to see this post... as the possible culprit.