have to sign in all the time

How come I keep being asked to sign in? I never had to do this before! I replied to a thread about 20 minutes ago and everything was fine. Just now I went to reply to another one and the response said I couldn't, that I would have to sign in again. To make it worse, I couldn't remember my password so the computer generated a password of random numbers. No way I can remember random numbers so I have to look it up each time. Very frustrating :( This started happening yesterday.

Check your user cp - under "Edit Options" there's an choice to keep you automatically logged in. Make sure that is on, and that your browser is accepting cookies!