Hi there, I find that I often have to pot before I can enter a portal. This error only occurs on my paladin and not my bishop!
Are you using a broken skill? https://royals.ms/forum/threads/new-source-bugs-master-list.87288/#post-460189
Some skills will make you "stuck" and unable to enter a portal until you use a pot. I think it would be helpful if you could find the specific skill that makes your character stuck. You can do this by using a pot and entering the portal, then using 1 skill and trying to enter the portal again. Repeat until you find the buggy skill