Four Spectrum Service Techs still can't figure this out!

I have to reboot my modem multiple times a day. When I lose internet, all my devices show that I'm still connected to the modem just with no internet access. The modem's internet light is still on. Here's where it gets weird, my Roku tv will still stream YouTube (not well). It WILL NOT stream Disney+, Netflix, hulu, etc... No other device will connect to any web page. When I call Spectrum, they show no outages to my modem. I've replaced the modem and still having the same issue. PLEASE HELP!