I might be looking too deep into this (and this might be a shot in the dark), but here is what I have discovered.
My
twinhan 1030a sends out 18V when on H polarity and about 14 V when on V polarity. Ultra sends out around 20-21V when on H and about 15V when on V polarity. I wonder if when switching from V to H or other way around it confuses
SG2100!? From what I have experenced, the dish starts moving for no reason when scanning the satellite and it is switching from H transponder to V transponder (and other way around).