nandohyphen1 I use version 5.12.25.0 and I have a paid subscription and have experienced three times that I was unable to connect in the last days. Turning it off and on again fixed it for me every time. Only had issues at start of connection. If I eventually got a connection it was stable all the way.
Maybe they have issues now that the UK has activated the age verification technology? I saw (online) that ProtonVPN was very high on the most popular downloaded apps.
I would recommend reading this article from the Proton blog, going through how they work when countries activate censorship. A really good read!
https://protonvpn.com/blog/fight-censorship-2024