I’m also using paid Proton VPN and have issues posting comments every day. If I stick to non-American servers things generally work, but if my random connection picks anywhere in the US, my comments won’t post until I switch and switch and switch and find a random server that works. I’ve rage-deleted quite a few comments after they refuse to post. It’s really pretty frustrating, but I won’t stop using my VPN to make Lemmy work better.