You will know if it is an LNB drift if you go to menu 6-1-3 'system info one' and the status shows LNB drift detected...if it shows this then you definitely have a problem. The LNB, if I understand correctly from how it was described to me is when the LNB (the eye on the dish) does not stay connected on the frequency it needs to be locked on....kind of like a car radio, the farther away you drift from the main station you are listening to, the less clear the signal, same thing applies with the LNB. If an LNB drifts there is no other way to fix it other then to replace it.