An issue with loading websites has suddenly developed on my Windows 10 PC. Many sites never load on Chrome because they are Waiting for fonts.googleapis.com forever: one example is Tom's Hardware. GitHub Pages sites don't work either. On Edge, these sites sometimes load with no CSS, and other times don't load at all.
I have also been noticing some other network issues lately, such as YouTube videos occasionally not loading in Chrome while working fine as an embed in Discord.
No other devices on my router have any of these issues.
How should I diagnose and resolve this?