WDTV Playback Issue

When i am watching a file on my unit it stops playing and the WDTV logo is displayed. I then have to turn the unit off and on to carry on watching. The unit also turns itself on at random intervals.

I have recently moved house and my network configuration has changed. I used to use a static IP address on a wired ethernet connection to a broadband router. I now use a DHCP set address with an ethernet connection to an Edimax wirless access point which uses wireless to connect to the router

Anything else that changed before the problem started, like a firmware update?