[TYPO3-english] feuser suddenly logged out

[Alexander Dick]

Hi folks,

We have developed a website where you can apply for different jobs, this 
is basically done via felogin and a custom application extension 
developed with extbase.

The application process has multiple steps.

Everything runs like it should, there are numerous applications 
submitted every day, except for this:

Some users get logged out in the middle of the application process. This 
happens at arbitrary positions, some in step 6, some in step 2, no 
special pattern visible here.

 From the client side I can tell:

- It's not the Browser - most of them use modern browsers (also happens 
with Firefox 11 for example)
- Cookies are activated

Also $TYPO3_CONF_VARS['FE']['lockIP'] is set to 0, to tolerate changing 
IP addresses during the session

I can't reproduce it, no idea what's happening here. How can it be that 
the session cookie suddenly is lost?

The lifetime is set to 0 (expires when you close the browser). I did 
already set it to 1 week, with no change.

Any hints would be really appreciated.

Thanks
Alex