devise constantly losing connection to internet

First. Please try starting here if you wish;

https://forums.xfinity.com/conversations/your-home-network/connection-troubleshooting-tips/602da777c5375f08cdea3db9 

Greetings @dragons4,

You're heading down the right thought path. It just may be time to swap out that older XB6, but there are a few other pain points that could be contributing. If the root cause of the issue isn't address swapping the modem won't have much of an impact. When you say that your devices are losing connection, are they running slow or completely disconnecting from the network. Also is this happening on all of your devices or just some? 

@dragons4 

Have you had a chance to see if any of those troubleshooting tips apply ?