We have the same issue with our box freezing at night time - just had it crap out part way through watching a movie, then a black screen for 20 minutes, still on hold to talk to someone at VF - I have better things to do than spend my life with a black screen and constant error messages and disrupted tv viewings.
The old STB's were awesome. This is a piece of junk. Do you also get SA0005 error message or "cannot connect to internet" when this happens or various other meaningless error messages? I mean meaningless because you ring VF and if you are lucky are 20 minutes on hold (whilst thinking of the glossy brochure we all got sent saying we promie to answer your phone call in 2 mins or less!!! yeah RIGHT!) abd when you do get through to a VF ninja you always get the one with the white belt who has done three minutes training to be a ninja and has no clue but vague answers?
I guess we should be thankful it is one box so far tonight - usually we lose our box in bedroom and also lounge AND our internet all at the same time.