Why does my Sametime status automatically change?

I have HCL Notes 12 FP5. When I login to Sametime my status displays as available. After about 20 - 30 seconds my status changes to "I am away from my computer now". Why does this happen? I use token based logon in the Notes Settings. Switching off "Automatic Status change" does not make any difference.

@Andrew Fastow

Please check your preference setting for Autostatus changes.

check to see if you have any settings that will put you n away status enabled.

in notes go to File >> Preferences >> Sametime >> autostatus changes

also check your setting on File >> Preferences >> Sametime >>status messages

make sure that the default log in status is available