I suggest anyone with a flaky sky box gets on ebay and searches for SKY PSU or similar.
I have a SKY HD box that would stick in standby, lose signal, drop recordings seemingly at random.
All cured by fiiting a new psu.
Now works 100% via the STB - before it would sometimes lag behind the beo4 a bit.
There are various suppliers - it took me about 5 minutes to replace the board....a doddle - or you can buy a kit of capacitors - as it is duff caps that are the root of these problems - if your handy with a soldering iron.
The seller I used even offeres a part refund when you send the duff board onto him - so about £20 all in...