Transmit/upstream data issues tonight
Seems to be stable now. Maybe I posted too soon. Still had the issue better part of last hour.
It's very possible that the issue you're experiencing is due to some pretty nasty weather around Albuquerque, NM, which is where your gateway is located. The issue being intermittent makes it even more likely that this is the cause. I'd keep my eye on the weather around there.
However, if it doesn't clear up within the next few hours (or when the weather does) it might be something else, at which point you should definitely call. The reps aren't back until Monday, and if it's still doing it then they can definitely take a look. In the meantime, make sure the coax connector is finger tight at the back of the modem. It doesn't need to be tighter than this, but it shouldn't be loose. Also, if it doesn't clear up, try plugging the modem into a wall outlet if you presently have it plugged into a strip or surge protector, as those things can sometimes wreak a little havoc on the electricity throughput.
Good luck. :)
