I am also having this problem.

Never had it in 5 years as a member until about ~2 weeks ago when I noticed it as I went to review a story.

In the forums I seem to have about 10 to 15 minutes before I find I am logged out again and find this very frustrating when trying to post comments.

I have cookies on as I always have, I check the remember me box everytime, Java script is on, everything is as it has always been as far as I know. No new software installed lately.

Would be nice to find a solution.

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