When LNB drift is indiacted, the LNB should be replaced. The next item is to disconnect the coax from the receiver(s) and run check switch
this clears the matrix.
Once the check switch is complete, reconnect the sat in coax to the receivers and run check switch again.
Check the system info screen details to insure drift message has disappeared
I did that,same results,no drift now this is with my 625.