Intermittent Connectivity Issue

Is it all devices? just wired devices? Just wireless devices? 

Xfinity is very good at initially saying “its not our line”. 

but without a cable connections page and event log, its tough to believe them. 

I’d post a screensnip of those back on here so we can see how it looks. 

where does one find: a cable connections page and event log?

my issue seems to be just with my work (fed gov with VPN) laptop which is wired, VPN disconnects 3-5x per work day for just a minute or 2. My home pc wired doesn’t have issues. I reset my modem/router at least monthly.

if its only one device with issues and it happens to run a vpn, tends to either indicate the vpn or its settings. What I’d try doing is setting the device that uses the vpn in the routers DMZ

ok, so what do I put in these boxes?

That specific computers ip address

My problem is across all my devices.  Tv’s, security cameras, PC and cell phone.  Sometimes I lose connection briefly and it returns.  On several occasions lately I think the modem has to renew a DHCP lease with Comcast which causes me to have to sign back in to services like FUBO TV on my smart TVs and Chromecast devices.  My security camera DVR throws up a blue menu any time the modem disconnects and we have to do a mouse click to get it to go away.  That is how we know just how often the service has begun to disconnect lately.