This happens on my THD, but only on The Weather Channel. I'll switch tuners to check the weather and its playing from the beginning of the buffer. No idea why.
This thread, "Output to TV from Buffer Instead of 'Live' Signal", discussed a similar problem.I have a Tivo Premiere that will just decide to skip to the beginning of the half hour live TV buffer, so you're watching TV from a half an hour ago. Its in an office and I thought it might be something sitting on the remote (the desk isn't what you'd call tidy), but after moving the remote to a location where it's left alone, it still happens. Seems to happen once a day.
Kind of annoying with a brand new Tivo. Only had it for a month. I thought I'd try the community first before going back to Tivo.