Check your signal levels in setup, also check to see what the System info screen says as in showing any of your sats in red? Might also look at the dish to see if something has moved it slightly like the wind seeing as there was a large amount of storms that went through the area today.
I called Dish, after they had me run the check, I seem to have lost the 129 sat. They are sending out a tech. Sat. morning. I hope it was the wind/hail from the past couple storms we've had, and not trees putting out new leaves.... there are some trees in that general area, but it was fine the last 4 years. SD channels are fine.