I am running dvb-s freeview into my htpc. All is going well except for a weird little video/audio glitch I get every 30-60 seconds. Its only brief but the picture kind of "pixelates" and the audio stutters at the same time but only for about half a second at most. Its still very watchable but is getting more and more annoying...

Dvb-s freeview using Blackgold 6in1 tuner card (2x sat tuners)
Vista home premium x86 with tv pack
Satellite signal split 3 ways: 1 for the sky stb (power pass goes in here) and 1 for each sat tuner (passive)
Have updated drivers for everything and done all updates

Anyone experiencing this or know what it could be?