How to fix pixelation caused by new Comcast XB8 Modem

I had the same issues with pixelation every 30-45 seconds on every channel of live TV only (streaming was fine). This happened as soon as Comcast made me upgrade to the XB8 Modem (white, rectangular, stands upright). I FOUND THE SOLUTION. After coming across another customer's post on another Xfinity forum, I replaced the 2-way coaxial cable splitter with a Cable Amplifier (Amazon, Reliable Cable 5- Port Cable TV Modem Splitter Signal Booster/Amplifier with Active Return, $28.84). I would hope that when Xfinity tells people that they need to upgrade their modem that they also let people know of the signal issues between the new modem and existing cables. I hope this helps someone out there because I know how frustrating it was!