We have the same issue too but it started way before December as some have noted. After all the refreshes and restarts, a comcast technician added a signal\booster to one of our lines attached to one of our TV's and even though we still have drop-outs, they are not as often as they use to be. I am a data recording technician and from I have troubleshot myself (mostly checking various equipment and configurations), I am leaning toward the signal being the issue. I've been busy for a while due to medical issues but when I get a chance I am going to start looking into the signal strength and the signal quality (check for noise or dropouts). If I find anything I will post it when I can.
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