Some websites are not working.

I'm really new to Linux. I've installed pop_os a weak or so ago. So far I haven't had any issues that I can't fix with a bit of google but this one has defeated me. Some websites are taking ages to load, some don't load at all while others are loading correctly. It's not a consistent issue. For example YouTube loads instantly but Reddit only loads it's front page. I've tried a lot of fixes but none seem to work so far. I've dissabled my add-ons, opened the websites in new private windows, changed my browser, changed my dns and changed mtu. The last 2 I'm not completely sure about but I think I've done them correctly. This is such a weird issues, as far as I know my browser shouldn't be affect by my os but I've had this problem only on my laptop.