Not counting electrical outages of which there really haven't been many at all, I've found Comcast pretty reliable. In over six years I've had an outage that lasted for hours (once almost 24) maybe 3 times... these were all Comcast equipment failures (I know this because I checked with Comcast). But during hurricane Irma last year there was no outage at all here.
Every now and then the bandwidth drops off , sometimes to almost zero, but that lasts for minutes, not hours and it recovers on it's own. I'm not monitoring the bandwidth all the time though but I'd guess that happens maybe once or twice a month.
Also every now and then I get an outage but rebooting my router fixes it. That could be the router just going south or it could be a Comcast issue, that's hard to say.
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