I switched my Premiere to the HDUI a couple of days ago just to see if it has improved. It's sluggish but usable IMHO, but I'm still going back. I haven't had any lockups or reboots, except this one. (Could this be related to the Stops Responding to Remote Commands problem somehow?) If I enter DVR Diagnostics, then back out with the < key (left arrow) when I'm finished, I can't navigate out of the Account & System Information screen. (The yellow LED does flash.) The up and down keys work, but the left and right keys do nothing. The "<" normally shown is missing, indicating that TiVo knows it can't do that, but the ">" stills shows, yet I can't navigate back into DVR Diagnostics either. In fact I can't navigate into System Information, Media Access Key, etc. Waiting several minutes doesn't help. Using the TiVo key gets me back to TiVo Central, so the Premiere isn't really locked up. This anomaly does not occur with the SDUI. FWIW, I'm OTA only. OK, I left it stuck, and after a while it exited to live TV automatically. The Live TV button also will exit, but when I use the < key to go back to the Account & System Information screen, the left and right keys still don't work there. Exiting with the TiVo key fixes the condition.