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CM100v2 REBOOT LOOP
Since Xfinity started their 10G network upgrade my modem won't connect and will reboot several times before it stop. In order to get the modem to connect and stay connected is to manually specify a ...
Not sure what splitter you added but you dropped quite a few points on the downstream and increased your upstream to a level that can potentially cause errors.
If you used a double/triple splitter, pull it back out, as it shouldn't be dropping power that much and putting that much resistance in line.
If it were me, I'd directly connect it to where the coax comes in, and when you get the errors, call xfinity and have them come check the line. By directly connecting it, you ensure there isn't anything in the home causing issues that xfinity can bill you for.
More likely when they upgraded your area they changed something at the hub. Right now, your power levels are to high and its causing errors. You can try putting a attenuator in line or a double/triple splitter (make sure the other ends are capped) to try to drop the power a bit.
If that doesn't help, you'll need to contact them as there could also be other errors from changing out the hub/cmts. When they upgraded my area, they had to come back out to fix a connection as it was loose at the hub. When you're changing out a bunch of them, its easy enough to under tighten one.