2.4 Network is not stable or unable to connect

I've had ongoing issues from August 2021 until now Nov 2021. It was working from end of Sept to beginning of Nov - until the major California outage Monday the 8th.

When Xfinity combined the networks in August 2021 my IoT devices would not connect, so I had to break out the 2.4 and 5 networks. This worked for a while.

Then they had a crew on the street one day doing work, and when they left my internet was bad and the router/modem (all Xfinity) could not be seen by them to remotely troubleshoot. They sent a tech. He found an issue in the street and fixed it (said was hanging on by a thread). The connections worked when he left. The next day the 2.4 was not working again - or intermittent. Sometimes restarting the router would help but wouldn't stay connected for the whole day. They sent another tech who got the modem to be visible remotely but could not fix the 2.4. The advanced support then called and it was resolved and working great for a month.

Then this recent major power outage on 11/8/21 - I was back to square 1 again; 3 calls to main support, 2 to advanced support and 1 onsite tech who swapped the router. Still didn't work. When I called to check next steps they had closed the ticket!!!! And sent me back to level 1 support - wouldn't even allow me to talk to level 2 again. Just spent 1.5hrs on the phone with level 1 to say they want to send another tech to swap the router as that was what is in their book as next steps (which we already did 4 days ago).

Nothing else has changed in my set up - router in the same place, same computer, same phone, same furniture, etc. and I have spent 6 hours this week alone on the phone in person. 

I can't go into the advanced settings myself anymore and change the channels either. Or as it worked before is temporarily disconnect the 5 - hook up my devices on 2.4 then reconnect. 

We also have changed the name and password with no luck and every time that happens I have to reconnect all the devices which is a PAIN. If they could it get stable I don't mind but at this point I am not using them - including my doorbell. 

They can't even tell me what they did the first time to fix it. It is great when it is running but these recent changes and the inability to troubleshoot the network effectively is horrible.

If anyone else has something I can try or someone I can contact at Xfinity they can actually help take to a resolution that would be great!