Devices will not connect to internet properly for days on end, have had this problem for years with no solution.

This has only been an issue in my house, and it's happened for so long and with nothing that's able to fix it that i'm starting to think it's just someone that's been dedicated to hating and DDOSing me for the last 4-6 years. My house uses Spectrum (I know it's an awful company, I don't make the decision on the provider in the house) and for the last couple years my devices will have random moments where they will absolutely refuse to connect to the internet for days at a time. This has happened on 2 Lenovo laptops, all 4 iPhones, and my VR headset. The only device I haven't had this issue with is my iPad for some reason, which has kept me pretty sane about the issue since it is what I primarily use at home, but I'm getting to my wits end about this issue.

When it happens, devices will connect to the internet but will say "no internet connection." Restarting devices and unplugging routers does not fix the problem. When this happens on my computer, most websites will say "DNS address not found" and for some reason, some websites will still work, but not enough to really allow me to use my computer. I can't recall which websites specifically are the ones that work since my computer just started having this issue after a long while of having it, though.

Restarting devices does not work. Unplugging the router does not work. We have replaced both our modem and router with non-Spectrum branded ones and it has not fixed the problem. We have had, on at least 2 occasions, Spectrum workers to come out and fix the problem and they could not. I have not found a single post online of anybody having this same issue and sometimes it feels like i'm losing my mind. It is so insanely frustrating to try to use any of my devices and being surprised with not being able to use it for the next several days. This subreddit is sort of my last hope before considering getting in touch with an actual professional. If anyone has any idea on how to fix this issue or what could be causing it, please let me know and I will try to fix it within reason.