Modem/Router Combo - Wifi looks like its on but internet not working

[Cayley]

Internet has worked for over a week. Then suddenly nothing... Had Spectrum out and it was fixed again, only later the same day, no WiFi AGAIN... Now when I try to connect my phone it shows full bars, but the internet doesn’t work... Please Help! (Already tried unplugging for 15 seconds and turning off phone - then turning router back on first, also factory reset button). No light next to globe icon, two lighting bolt looking icons have blue/white flashing lights next to them.

[plemans]

The cg3000d was a modem/router combo device that was sold directly to ISP's. Some devices made it into the retail market but Netgear doesn't support them, the ISP does. 

usually when the upstream/downstream light is flashing, it is trying to lock onto a channel and doesn't have a connection. You're phone is connected to wifi so it isn't a wifi issue, its a modem side issue. 

A couple things you can try.

1. log into the cg3000d and take a screen snip of the modems connections page and post it here.

2. if you have any splitters, amplifiers, attenuators in the coax line, remove them.

4. preferably you should directly connect the modem to where the coax line enters the home. this prevents the coax wiring within the home causing the issue. 

5. check the connections for being loose, corroded, cheap/bad. 

[michaelkenward]

... and the last place to find useful information on that device, or any cable modem/router, is the section of this community given over to Apps and Services, some of which don't work with those devices.

You might get better and quicker replies, and find other answers, over in the appropriate section for your device:

Cable Modems & Routers