DVR resumes recordings at incorrect times

[clwheat]

I've been having a problem with my DVR resuming recordings at seemingly random times.  This occurs when I start watching a recorded program, then exit it and attempt to resume it later.  In many cases I'm not given the option to resume, only to play the recording from the beginning.  This is somewhat annoying, but the bigger problem occurs when I leave a recording (say, in the 1st period of a hockey game), and when I resume the recording later it picks up an hour further into the recording (in this case the 2nd period).

Has anyone else experienced this?  Do you have any suggestions?  The DVR is a Cisco CHS 435HDC, in case that matters.