i had E over a few weeks ago because i was losing signal on my HD channels only and they put a new lnb and adjusted my 61.5 dish and since then my picture on the HD channels goes blank and the screen turns yellow for about 5 seconds then the picture comes back and this happens a few times during the course of the day on my 622 and my 211 receivers. should i call dish again or is everyone having this problem lately?