Digihome PVR80

Ok recently bough one of these from ebuyer
Digihome PVR80 80GB Hard Drive Recorder Grade A - Ebuyer

It came today and so far all i have encounted is bugs and problems, i set the box up and decided to record something and as soon as it started to record the thing i was watching would freeze jump skip and didn't stop, i decided to unplug the cable between the two tuners this seemed to solve said problem and recording seems to still work.
I decided next i would have alot at something i recorded earlier, i went into libary and pressed play to encounter 55 mins of stuttering and jumping of doctor who.. i wasn't impressed.
So basically anyone know what to do?
Thanks

CozzyB

/bump