Dear friend
it is not a cause of clone, it is because of L TUNER, if in your dreambox L TUNER you cannot tune above from 27500 symbol rate,
for tune above from symbol rate you need M TUNER in your dreambox 800 hd
i have the same problem, then i change my TUNER and now i can tune Dish tv True Hd Asiasat 5 at 100 degree east with good signals.
Thanks