Internet plan: 1000/35
I've been using the above setup for a few months now, and things have been fine. Over the past few days, I've started having an issue where connections will just freeze for a few seconds on a rather frequent basis. This is evident, e.g., in ssh connections to remote servers (type, nothing appears, until all of a sudden it does) as well as running remote applications over a VPN (the application freezes for a bit every once in a while). It's gotten to the point where it's quite disruptive to work.
Tonight I connected my laptop directly to the modem and verified that the issue still occurs. So it's not my router. I both power cycled and factory reset the modem, and the issue persists. Looking at my signal levels, I do see that the upstream power is a bit high (~53 dBmV). I also see a few T3-timeouts in the logs. But, again, I haven't made any changes to my setup for a few months and this issue has only arisen in the past few days.
Any hints as to how I can go about getting this resolved? Is this likely an issue in the house, or is it on their end? If I have to call Comcast, what's the quickest way to get them to send someone out to look at our cabling?