PHPMyAdmin Session Timeout too short

Hey,

When using phpMyAdmin through plesk, I get session timeouts (need to re-login to plesk) after some 5-10 minutes.
I've set Plesk sessions to last 30 minutes, phpMyAdmin sessions are set to 2 hours.

Both I and my colleague log into plesk using different accounts, but both are admin accounts (I think that's the same account for plesk internally). Could it be a bug in Plesk that cuts the session short, or is it some configuration option that needs to be set?