It was due to the fact that I added the forum sessions handling into other pages of the website (like the music, plugins, etc. pages). But I forgot to initialize some cookie settings for the phpBB functions. So nothing directly related to a phpBB problem.
I got this problem while working on the pending plugins. I wanted to submit it and , tataa got logged out and had to paste in all the information again.
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Thanks for your help . BTW, in my diploma I have to work with a bit SQL 
