Internet connection dropping connection every 70 minutes. Yes another one and it's also xb7.

Yep. That can be odd that it's that reliable..... We've seen here in past posts that this sometimes is attributed to appliances / devices / motors / machinery either at or near the premises, or somewhere in the neighborhood are turning on and / or are cycling at those regular intervals and they are injecting spurious noise into the lines which of course disrupts the communications / signals. 

Good luck with it ! Please post back with how things turn out.

Thanks. There is a single splitter in this installation, and it was installed by Comcast when they did the cable install. So it sounds like I wait it out until tomorrow when the tech arrives. At least he can address that aspect of it. 

So, now the million dollar question. Why would that cause the modem to retrain every 70 minutes?

BTW, I'm not trying to be snarky as I fully agree with what you're saying about physical layer causing all sorts of pain. But, most of the time I've seen that the timing is random. If there's a job that runs say.. 60-65 minutes on the ISP side, I'd buy that too. But otherwise, the reliability of the timing is very odd.

The upstream power is too high (it's already out of spec on channel 5) and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

Tech just left, they have to replace the wire from the box to the house. There's significant signal loss between the two.

Please post back with how things turn out. And with another sample of the stats after the work is done.