Upload speed near 0Mbps third night in a row, starting the exact same time

First two nights, that could kinda be explained by heavy TV service usage due to what was being aired. But not the third. This is a nation wide issue affecting both TV and Internet to ALL customers. Starting at 7pm EST and staying until 5am EST. Upload speed stuck between 0.01Mbps to 0.12Mbps, effectively killing internet access as all connections timeout. One or two nights during heavy traffic flow that could be random hardware failure, but a third night and not heavy traffic flow that is no longer random hardware failure, it's timed and intentional.