I have 2 622 and one 612 receivers. Four times this weekend I will be watching a previous recorded show and all of a sudden it just crashes screen goes blank and the a warning sign comes on saying acquiring signal it should take 5 minutes. Background info had a dusting of snow on Saturday. Cloudy all day Saturday and Sunday. Today very sunny. Tempertures have been 25* Sat. 20* Sun and 4* today. There is no snow on dish. Have done a check switch test and everything checks out ok. After acquiring signal is completed everything is back to normal. This has happened on all my receivers at least two times each. Also notice that on 2 separate occasions two receivers were not on and they did updates at unscheduled times. What do you think?