Read the forum guidelines
So my internet slows from Giga speeds to around 5-6 every 24 hours.
Calls to support have been useless.
I've replaced the modem and I've tried three new routers.
The problem never goes away.
The only fix is a modem reset.
Have you tried bypassing the router for 24hr and see if the problem continues? Also, what model modem and router do you have now?