It could just be ISP going to shit. What you're describing was a common thing when my family was on the inferior of our local ISP options. If you know anyone else in your area that uses the same provider, check to see if they're getting similar results.
But since what you're describing with TF2 sounds like your upload speed being shot, that could be either your ISP failing to keep up to the task, or it could be some sort of virus that occasionally makes large uploads. I'm not clear on which free antivirus services are good for checking on this (I just shell out for SpyHunter so that I get the full detection and cleaning functionality).
It might be good to check to see if webpages take longer to load, too, since it is very noticeable with certain forms of viruses that like to do things like inject ads into your search results.
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