Halo: Nightfall. Doesn’t run smoothly?

I bought Halo: Master Chief Collection and it came with the Halo: Nightfall series which I’m interested in watching. However, (I’m still on the first episode because of this) whenever I try to watch the episode, it skips, buffers, has bad quality and sometimes just doesn’t play. I am quite frustrated and would like some help.

Thanks,
MikeyRulezz

Do you by any chance have any other downloads going on in the background? If not, are there other devices connected to your modem/router that take up lots of bandwidth?