I have 2 single standard lnb on a 36" dish just as of late the 82 has been bouncing from the usual 90% S&Q to mid 50% causing pixelating. The 91 lnb is going strong at 90%+ on S&Q, no trees or leaves in the way. I don't think the dish has moved. Maybe needs a tweak? Fat bird may have sat on the 82 lnb? I just find it odd that only one of the lnb's would fall out of sync.