My internet cut out at least 25 times Today (new personal record)

Not using any splitters, bought new coax cable, changed my settings all around such as using static IP address. Nothing helps. Internet cutting in and out every 20 minutes. Really frustrated. Can't get any work done. 

I might need to check the cable box outside my house to see what is really going on.

The upstream power is too high (not much wiggle room) 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.

If nothing below applies, then you'll need to get a tech out to investigate / correct the problem.

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.

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !

How do I get more upstream bonded channels? I only have 2 locked out of 8. Do I call xfinity? 

The upstream power is still too high on channel 2. This indicates an upstream channel / return path signal impairment. Signal impairments can definitely cause the un-bonding of channels. Perhaps it would be best to get a tech out to investigate / correct this problem.

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.
Good luck !

@EG, Do you know why it is so high? I don't think I have a bad modem. I did try everything that you mentioned above. Maybe it's just my neighborhood receptions. Who knows. 

It's not the modem, it's a line / hardware / connection impairment somewhere. There's too much resistance and / or noise in the lines so the CMTS / system is having difficulty hearing your modem, so the system instructs the modem to put out more power / shout louder to try to help it to hear your modem.

First, try power cycling / rebooting the modem. You'll never get "8" as they currently offer only 3 to 5 depending on the local system.

*Update*

Since I only have internet and not TV or phone, I unplugged 2 outta 4 coax cable in my cable box hoping to get better signals. There are 2 fixed coax cable in there meaning it was nearly impossible to unplug it. Only master bedroom and living are active now. 

Here are the new numbers. Im still only getting 2 upstream channels. 

Of course I have splitters in the cable box provided by comcast but not inside my home. 

Quite welcome ! Glad you got it straightened out ! Now closing this topic.