This has been happening to me once in a while lately too.VIP 722 Ends playback and skips to end of program when a current timmer ends recording. Program must be restarted from begining and FF to restart point.
Software Ver L655
If your software version is L655, your receiver is not a 722 but rather a 722k as indicated on the front panel.
Does this happen on playback of any recording, or just when watching a recording in progress from the beginning?
My 722K skipped to the end after two innings.