Unstable Internet, Ethernet Connection

I've recently signed on with xFinity at the beginning of this month. I've really been having bad connection problems, specifically around 8-10 am and then 4-5 pm. 

I do work from home so this isn't something that can continue to happen. I purchased a 400 mbps plan so that there wouldn't be an issue with bandwidth. 

I also bought a brand new ethernet cable on Saturday so it's not the connection between to router and the computer