Are you picking up any Vertical signals? or just Horizontals?

Its either your dish has moved slightly and only picking up the strounger signals off B3 or your LNB is stuffed and isen't switching Polaritys from H to V when the box tells it

But to me I think your dish has moved as you say you lose reception every now and then what are the Signal and Quality readings for 12525 V 30000 compared to 12425 H 22500 ??

Make sure your dish hasent moved