Cannot fast forward above 4x

When I’m  playing videos and try to fast forward any more than 4X the WDTV player always stops the video and brings me back to the menu where I started. This happens while playing movies from my hard drive, playing content from hulu, and many others. Some video will FF at 8X but usually not. This makes it hard to skip forward to the part I want! I’m using the WDTV live over a wireless network- D Link wireless N adapter in the WDTV and streaming from a Linksys wireless G router. My base machine is a WiinXP with Playon installed. Any idea what could be the problem? Thanks!