CM1100 Channel Lock lED keeps blinking????

You have line issues. You have errors in your line and your event log is showing ofdma profile errors. 

The profile issues might not cause issues as your connection is a 500mbps connection and not faster (don't necessarily need a docsis 3.1 connection for those speeds with xfinity). 

So it might connect and work fine but with all your line errors I'd be looking at it closely. 

Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.