How reliable is the FileHandler session driver?

CI4 definitely has issue with interwoven AJAX calls. There’s a warning about it in the docs. I’ve never traced it down or pursued options, but it is annoying.

Yeah I switched over to the db handler. This intermittent issue is very annoying. The docs had a note about how the session is locking now and shouldnt be disabled but the use case doesn't really apply here since I am writing a bare bones auth system and it can't seem to hold onto session data.