I still get randomly logged out in this new format

I hate it! It happens even here. I'll be browsing forums actively and suddenly it logs me out. I don't like having to put in my username, password and a random string of numbers. I think this is a core issue. I don't know if its just me though, but this has always been an issue. I'm using firefox on windows 7 64 bit if that helps at all.

Not sure if that is a site issue or just a community section issue.