I have a BushIDLCD26TV07HD The picture keeps freezing, then I can't change channels and then it takes ages to shut down.

Here is some info about them:
Bush Radio - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Bush_Radio)

Scroll down to the #2 item of the contents.

Since the digital switch over my TV keeps freezing (especially when changing channel) is there anything I can do to stop this, it also takes ages to shut down when this happens,