I was thinking that the 60fps was causing the issue, but it persists in the 30fps footage on Youtube.
Once again, looks GREAT on my local machine.
Too high of a bitrate needs a strong connection to support it . I had the same problems. I had to lower the bitrate to less than average to get clear video. Plus my upload times increased !!! From over 2 hrs to just an hour. Just because your connection at home is a high mbps. Don't mean your phone or such can achieve that rate.