About a month after my parents got a new 4K Samsung smart TV we started experiencing intermittent internet problems every night around 8:00PM-1:00AM. I thought the problem was with our ISP so after a few weeks I called to complain. Time Warner told me they wouldn't do anything until I replaced our 5 year old router, so I did and the problem seemed to stop. A few days later it was back, so I complained to Time Warner again and they said everything on their end was fine. After a few months of this I got fed up and installed DD-WRT on our router and the next time the issue occurred I started looking at the metrics. Turns out the smart TV was uploading a HUGE file each night and killing our internet (we only have like 2Mbps up). I ended up limiting the upload on the TV to 56Kbps and the problem went away.