desktops hard wired to gateway show up as offline in the web interface and both work without issue - can't port forward in the app

First off - give us the ability to use the web interface again to port forward - the app is ridiculous for device management.

I have two desktop computers plugged in via ethernet that keeps showing up as offline even though I am connected via ethernet. I have tried restarting my modem, changing the physical ports they are connected to, forgot the pc's via the xfinity app, changing my ip, turning off IPv6, setting IPv4, disabled UPnP and re-enabled UPnP, released the IP's, renewed the IP's, set to preferred IP's, removed from preferred - probably a few other things I'm not thinking of atm. 

When I restarted the modem, it showed both pc's connected in the web interface and for a moment I thought I finally fixed it, but after a bit I went to check on the app if they were still connected but they were not in the app at all.  The web interface shows them again as being offline, being online a few minutes prior.

I called into support (had a 40 minute wait so I asked for call back which they did after 40 minutes only to go straight to voicemail - so I called back and had to wait another 40 minutes) and they did a couple things on their end that ended up restarting the gateway and 'fixed' the issue long enough for me to end the call with them - only for the pc's to revert yet again to both being offline.

I see many other posts regarding this but no resolutions without having to send PM's.  Another ridiculous notion but whatever.

I'm ready to buy my own gateway and get rid of this mis-managed garbage that costs me too much to rent for what?  40 minute waits for no real solutions?

Can someone provide some real solutions to this issue besides the following that does nothing:

Leave your ethernet cable plugged in

Leave your modem/router plugged in

Open the app

Go to unconnected devices

Find the problem device

Click the device

Click forget device

Go to home

Scroll and click restart router

Wait the 12 ish minutes it says it will take

When it comes back up the app will finally recognize the problem device as online. I was finally able to port forward and see my device as online.