I have had this problem previously. I am ticked to stay logged in but today, I have had to log in three separate times while answering a couple of posts. It either tells me my post is inappropriate! or some such rubbish.
When I've answered a post, I cannot submit. Have to open a new page and log in again and then copy/paste answer from original. then remove the original, so if things don't make sense this is the reason why.I have now given up as I cannot keep doing this whenever I respond today. It was solved for a short period but it shouldn't happen at all. What's the point of 'ticked to keep logged in' .........