I've seen two new (to me) messages on my TiVo HD, with CableCARDs and Tuning Adapter, during the last few days: 1. (not exact wording). Press select if you wish to continue viewing this channel. Otherwise the channel may become unavailable. This appears to be related to the SDV system wanting to reclaim a channel. 2. (not exact wording). Waiting for synch. This occured after one of the occasional video/audio freezes that I get, always with zero RS errors showing in DVR Diagnostics. When the message appeared, the audio had resumed but the video was still frosen. After a few seconds both resumed. Both messages seem to have plausible reasons for appearing but I had never seen either in 2.5 years of running this setup.