I have two Series3 HD DVRs connected to my wired home network. Both units have M-cablecards and tuning adapters attached for service through Time Warner. Starting 12/9/2011 (Friday,yesterday), both units have started freezing. The units do not respond to the remote. In some cases, the video and audio continue playing... others the video/sound completely freeze. Occasionally display oddities occur, like the playback status bar appears at the bottom of the screen but won't disappear and doesn't slowly move as the video plays. But the most odd thing that I've noticed is that both units freeze at the same time. My living room unit just froze and sure enough the bedroom TiVo was also frozen. This is the third time I've unplug the units to reboot. About 4 hours passed between the most recent reboots. I've never had an issues with these units prior to last night. Has anyone else experienced this? How can I check when the last firmware update occurred? Any suggestions?