Comcast you say? I had the sane problem and decided to contact them. I requested a new modem, a different company made one than the one I had. I asked for an ARRIS instead of motorola, Now everything works A ok.
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So I am having the same issues. I have Comcast and am using a Motorola modem. Do you know if there is something specific about this modem that causes an issue? Should I try and switch to a ARRIS model?