Before yesterday, my setup was a Dish 500 on 61.5 and a Dish 1000 on 110, 119 and 129. About a month ago I started losing some HD channels sporadically. in the last 2 weeks I lost them completely. System info showed that 129 was out. Called Dish - the tech said the reason I lost 129 was a neighbor's tree branch. The solution to the problem was to remove the LNB for 129. When the tech did this, 61.5 was able to provide the missing HD channels with no problem. According to the tech, the weak signal from 129 was "confusing" the switch and preventing it from locking on to the missing HD channels on 61.5. With 129 gone, the conflict was resolved and I got back my missing HD channels.