I know you said you checked the connections...and this is a long shot...I was having a similar problem, called Comcast, they were going to have someone come out, and then I decided to change the HDMI cable with a different one...BINGO, problem fixed. I don't know it the cable was bad, or if it just had a bad connection, but I no longer have signal droppng, and it has been many months. Hope this helps, if not, give Comcast a call, or better yet, contact them online from their website via live chat.
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