Sorry to see that your still having problems.In my case i now have a actuator and v -box that works correctly but looks like my DMX741 may not still be set up right!Didnt have any problems with the 36" ku set up but this c -band set up has been a different story.I may buy just a c band LNB and see if that works out any better if these troubles continue.Let us know if using the c-band only LNB solves your problems! since your bsc621 seems to be like my dmx741.