The first answer to this type of problem is always "check your connections, remove unnecessary splitters, etc." but I've never seen this fix anything. When everything has been working fine and suddenly fails it's usually something on Xfinity's end. I too am seeing a weak signal on just a few hd channels (A&E, TNT, AMC, SYFY). There may be more but I'm not interested in going through every channel to find out. Most of my channels have excellent signal strength (98% or greater). The ones that I see failing are around 68 to 71%. I having checked SNR on other channels, but A&E is about 27 which is below minimum requirement (which I think is 30 or 31 if I remember correctly). In any event, I think the only way to get this resolved is to get a line tech out, but trying to get Xfinity to send one out without having them send an in-home tech out (which in my experience will be a waste of time since they always blame in-house wiring, etc.) will be next to impossible. For now I'm just watching the SD channels for the few failing channels. If I really want to see something on those channels in HD I can always use my Roku. If it wasn't for my better half I'd cord cut and just stream.
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