Devices won’t connect to internet please help

[ExhaustedMomL]

So my internet isn’t working anymore. I’ve tried talking to customer service they can’t fix the problem. It was working just fine until yesterday morning people started randomly being about to connect to my home network. I’d pause the devices but our connection speed became slow and the eventually uncooperative. The customer service attempted restarting the gateway, it didn’t work. Then we tried switching modems that didn’t work. Then they had me factory reset the modem which then won’t let any of my devices connect to the internet even with Ethernet. My web browsers keep redirecting me to the 10.0.0.1 admin login which never loads. I just see a spinning circle, I’ve tried clearing browser history and cookies. I’ve tried restarting the modem and even switching back to my old modem. I’ve tried trouble shooting my computer as well, but my boyfriends computer has the same thing going on. I tried connecting to WiFi on my PlayStation 4 it wouldn’t work, for some reason only my phone works with the WiFi.

Someone please help me I’m at a loss and I’m super stressed out. I understand it’s not the customer services fault for the issues I just want this to be resolved please.

[Skjellyfetti]

Are your computers/devices set to get a static IP address as opposed to getting one dynamically (DHCP)? 

[ExhaustedMomL]

I don’t think so. I never requested a static one, it’s usually automatically assigned.

[Skjellyfetti]

I mean on the devices themselves, not from Comcast. You can check your network properties and see if they're setup that way or not. 

[ExhaustedMomL]

What’s the resolution if that is the problem? I can’t check right now since I’m at work...

[Skjellyfetti]

IF by chance that is the issue, just change it to DHCP. I'd be surprised if all of your devices are set like this, but since your phone does connect, there's a good chance they may be...especially if someone else set them up for you and people rarely set their phones for a static IP address. If by chance you do need more advanced help, I do run my own IT Service & Support company out of home and am happy to look at things, but I am in Denver.