First, I have no answer to your issue, nor does Comcast it appears. Seems like Comcast should have a way of proving to customers, that at the demarc, the service is as promised. Realizing that issues can be intermittent, some form of recording monitor should be available, unless of course you are afraid of what would be revealed. Seems like it would benefit both customer and Comcast especially for their premium service customers who really do not want to hear "have you checked your connections?"
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