Anyone else experiencing download speed problems?

I have a normal download speed of 300 mbs. It has never faltered from that zone. Game play just fine as internet speed is great. But suddenly I'm pushing 15 mbs to it flickering on and off of the download. Took a day to install High on Life when it usually takes minutes for me.

Now I have this massive update for MW2 which isn't a problem. I'm patient. But it's randomly 172 gigs for an update which is very odd indeed. I have no idea why it is so large. It's the only COD game I own, physical copy and all.

Edit: I'm wired.

I got rid of Starfield thinking that would help. I know have 200 GB of space. I turned off automatic update check marks. I heard changing the DNS server does nothing. I have been up all night trying to figure this slow speed problem. And it's not my ISP either. I have checked down detector but most comments are 5 hours old and no one has reported anything else. I'm not trying to wait days for a download here, this isn't why I have a huge package deal with my ISP. On Wednesday Morning it was working normally, then Wednesday night it became slow.

The only thing I haven't done is turn it to sleep mode. I have an Xbox Series X, only 2 months old. I got a great deal with Spectrum and it has worked like my sweetest dreams. Anyone have any suggestions? I really need some help please.