I’ve had a 612 receiver since early May. Starting a few weeks ago (and I don’t know if this corresponds to a software update), the image occasionally freezes and turns pinkish purple. It resolves spontaneously after about a minute. This usually happens while I’m fast forwarding through a recorded event, but took place once during regular playback – never while watching live TV. I’ve tried resetting and also unplugging the receiver. Any ideas what could be causing this? The color change is particularly odd. A call to a Dish tech yielded nothing useful.