VAST PVR satellite

We travel a lot in our caravan so we purchased the VAST satellite system, which is great. We upgraded the unit with the PVR option and installed a hard drive. Is it just my unit or is this a terrible piece of software? When playing back a recorded movie it continually goes out of sync and you have to stop and restart. Also, the reverse jump function has a mind of its own, as it jumps anywhere from 30 seconds to two minutes backwards. Sometimes it jumps 10 minutes forward.
Are people experiencing similar sorts of problems?

Russell, WA