[THIN] Session timeout

Hi list,

In our farm (PS4.5 FR02) AD 2003 domain.
I never set the option to lock session or timeout session or disconnect after X minutes. But, yesterday I permitted the option to Lock Computer under GP where OU farm resides. After that, the option to lock computer is accesible to everybody logged into the servers. That is OK. But, for whatever reason (that I don't know) after 10 minutes the session is locked automatically.
Why?
How can I change this behaviour ?

Thanks.
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