The Bug Report that might cover this issue is here:

http://bugtracker.futurerp.net/view.php?id=5

i also have this problem. i was going to post a new thread about it but decided to check the forums for this topic, and good thing i did

it logs me out all the time when i look at forums and i never go over my 15 minute time limit. and the only domain i use is "futurerp.net"

Do you, by chance, have the 'bad' habit of switching browsers a lot?

no, i use internet explorer. when IE doesn't work, i use google chrome, but i havn't had problems with IE for weeks, so i havn't used google in a while.