Are you on the new software?
Your problems sound very similar to those I have experienced after receiving it.
I am now rebooting daily and find this overcomes that particular problem.
In spite of rebooting daily however it is still in the lap of the Gods whether another reboot will be required after trying to use the VOD service.
Be aware that if it is software problem a box swap will probably not help.
Be also aware, if you have a sammie, that you may well get box swapped to a Pace
.