Connected to WiFi, but no internet connection
I'm having difficulties getting internet and I'm not sure why.
I have Comcast Xfinity internet, and Arris Surfboard modem (model: SB6183), and a Netgear Nighthawk router (model: R7000P).
I am able to connect to the router's wifi with no problem, but I'm not getting any internet. It's weird, because it did work previously when I first set it up. This issue has kind of come up out of nowhere. The modem and internet are working order because I'm able to get internet when I connect a computer directly to the modem via ethernet. I have factory reset the router settings using the tiny pen button on the back of the router several times, which worked temporarily at one point, but isn't doing the trick anymore. I've tried completely disconnecting the moddem and the router for ten mintues, then reconnecting every several times. Sometimes this will work, but only for a short time. I've also tried switching out the cables and I've made sure the router's firmware was up to date, but still nothing.
Side note: Today, when I did manage to get some internet connection, I noticed that it worked fine until I tried downloading a large file from a remote server. The file downloaded about halfway before the connection dropped. This had happened once before. I'm not sure sure if this has anything to do with my issue, but it was an interesting coincidence.
Re: Connected to WiFi, but no internet connection
First we have to determine if its a line issue, a modem issue, or a router issue. I'd start at modem and line issue first. Only reason I say that is that you're still connecting to wifi but not having a connection to the internet.
One quick question before we move on to troubleshooting modem/line, when it goes down, do your hardwired connections go down as well? And can you access the modem with the connection goes down? (the default ip address for the arris is 192.168.100.1)
troubleshooting the modem.
1. remove any line splitters, amplifiers, attenuators, kinked coax lines, tighten connections, and if possible just move the modem right to where the line enters the house.
2. Get a screen snip of your modem connections page and logs. This helps us figure out how the connection to your house is.
3. How frequently is it happening? If its a couple times a day, direct connect a pc to the modem and use it. See if the connection goes down. If it does, its either the modem or the line.