Internet goes down every morning

Good morning, 

My internet goes down every morning at varying times between 8am and 10am. My devices both wired and wireless lose internet connected sometimes several times, every day between those hours. I've tried to pattern it but it happens at random times. I look to the xFi gateway its blinking yellow for a few minutes than back to solid white. I have rebooted it, I have logged into it to and reset to factory in case there was some setting, nothing has helped. It doesnt usually stay down for more than a minute or two but I work remotely so this has been quite a hinderance to my duties as 8-10am are my busiest times for meetings and such and my director is pressuring me to get it fixed as it kicks me out and they have to wait for me to rejoin. 

I have the white xFi gateway, no other routers.

This just started a couple weeks ago.

I have checked the only coaxial cable, it is secured tightly.

Just fwiw: Over the past 2 years I have had many tech visits and eventually a "regional supervisor" had to show up and tell me the signal to my house was "dirty" and they would need to call in a special technician or something, that was more than 6 months ago, it had been fine but now its randomly acting up again.