Let me start this off by saying that I have been using this setup for almost 2 years now without issue. I have Verizon Fios gigabit service with a Fios Quantum Gateway router. I also have the Google WiFi mesh system with 3 access points total. I have the main AP connected to the port 1 on my Fios router. I also have the ONT out of the wall going to my WAN port and then have the coax cable.
So, again, I haven't had ANY issues for the past 2 years up until 5 days ago. Fios must've been putting out an update because my fios one box was blinking green and seemed stuck on the update. After talking with fios early that next morning it went back to white, but the other box I have is still blinking green (who knows why, but TV works, DVR works, etc). That's when all my issues started with the internet.
After talking to Fios for 4 days them trying to do all these troubleshooting issues and saying it's fixed and then it's actually not is quite annoying. The internet issue I am facing is spotty internet where it'll be fine for hours and then drop for a minute or two and then come back, but when you work from home internet is very important.
Yesterday, I decided after Fios says everything was good on their side to contact Google WiFi support. The guy was very helpful and said the issue from the logs he can see that I am facing is I am having a double NAT or multiple networks. Your Google Wifi signal channels and the WiFi from Verizon is interfering reason why your network is dropping.
He asked me to contact Verizon and have them walk me through how to my Fios router in bridge mode, which they did no issue took a few minutes. I thought I was good the fios router globe was red (I assumed this was due to bridge mode) and then the wifi symbol below was lit up and white. Thought I was good because I have all my devices (10 of them currently) connected to my google WiFi setup.
Well... it did not go well and my internet was going offline constantly over a 5 hour span once this new setup was complete. Google support had no clue what the issue was, Fios says they had no clue either so I had to reset (hit the button on the back) my router and it went back to normal, no bridge mode, etc.
Everything is back up and running, but the internet is still spotty like my guess is there is still interference between the two which causes the WiFi to drop for a bit and come back. I don't know how to fix this or what I should do. I could completely get rid of the google system, but I have it actually so I can get wifi in places of my house where fios couldn't reach including my ring cameras outside my garage.
What's weird is I check my speeds via the google wifi system and I get 653 average download and 786 average upload, which seems awesome, right? I downloaded the speedtest app and ran it over my wifi when connected to google and then ran it over LTE today and over WiFi I got 41.8 download and 38.2 upload and then over LTE I got 108 download and 4.90 upload....I don't know why the numbers are so off or why my internet has been tanking all of a sudden after being good for 2 years.
Anyone have any ideas, advice, I am 100% open to anything at this point. Sorry for the long post and thanks in advance!