I have a Series 2 TiVO that has developed a very strange problem. From time to time, the picture will suddenly jump backwards a half-hour - in other words, what I'm watching now will be replaced by what I was watching a half-hour ago. When this happens, I can't change channels, either with the TiVO remote or with the conventional remote, until I go to the main TiVO screen and select "Watch Live TV."

I recently had my cable box replaced – could this be an issue with the cable guy wiring things wrong? Or maybe a power or hard drive problem? Any help would be appreciated, thanks!