C7000 – Nighthawk AC1900 WiFi Cable Modem Router internet speeds drop slowly until reset

When I got the C7000 it worked beautiful, no issues. After a while of use, I noticed our internet speeds and throughput were slowing down dramatically. I reset the modem, and it was perfect again.

However, the next day, it had slowed down again. I've tried changing settings, factory reset, different cables, different outlet, every troubleshooting thing I can think of. It still drops speeds throughout the day unless I reset/reboot it. I have no idea why.

Can anyone give me some input?