522 Auto tuning problem

[toppnotch]

I have my auto tune feature set for tv 2 to come on at 6am for channel 8 (abc) and then on tv 1 channel 4 (nbc) at 5pm, and the problem is that some times it will auto tune and some times it wont even though in the timers menu it tells me that it was done and their are no other timers at thoes times. Dish network just keeps sending me the same old box i am up to my 4th one with the same result. anyone know of a fix or any suggestions? thanks.