Is it normal for a 612 fan to be running even hours after it is in sleep mode? Also will Dish have a fit if I remove the cover and clean the dust out? The room is not hot,been 68 or lower all winter. The 612 has ample air flow, not in an enclosure. The house seems to grow dustbunnies abundantly. I clean my PC quite often as it clogs the heatsink, so just wondering about the 612.