I've seen the other posts(Solspace freeform "form expired" under EE 2.8) about this same issue. but they didn't really solve the issue. I really have to get this working as this form has dragged on a while with issues. I have a multipage form and I get the error sometimes after submitting the first page. Other posts say to disable the CSRF protection using the config.php, but I've been told this isn't good for security. I can post template code, but I don't know if my setup even matters as other people have the same issue. Please let me know if you need any more information, thanks!
Freeform Pro v4.2.2