He also moved you to the Ultra plan at $89.99/month and gave you his direct line if you had any concerns about the service, back in November. I don't see any notes past 11/22/16 - were you ever in touch again?
After wracking my head trying to figure out what would cause it, this is the only thing I could come up with. The required speed is certainly there at the given time I would try to watch a video, but the "choppiness" of that speed seems to be the only thing different between the two times. I can understand it, with more people being online during those times, and those small downloads and page openings and such that tens of thousands more people being on the system create during those times would surely create the choppiness, but I was surprised to find out it mattered so much. I figured speed was speed, and as long as it was fast enough, it shouldn't be a problem.
This, of course, is only a theory, but it's the only thing I can think of that's any different between the two times. That is, unless, YouTube is affected by the sun. LOL.
Then again, Windows updates doesn't seem to like satellite internet, either. I think their problem, though, may be related to the latency. I can download an entire Linux Mint installation file of 1.5GB in around ten minutes or so during off peak times of the day, but a 300MB Windows update takes hours and hours.
To add, I can't really blame Hughesnet for either of these, but more satellite internet in general and the lack of available ground based alternatives in my, and I'm sure your, area. But, such is life. In the scheme of things, it's not all that important.