User login not working

I am developing a forum using phpBB. It has a problem with authentication. Users have to login very frequently, almost on every HTTP request. What could be the cause for this?

Solution

Add this line to your login form:

<input type='hidden' name='autologin' value=1>

I had the same problem on my website and adding this line solved it.

Call to undefined method Dompdf\\FrameDecorator\\Page::add_line()
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