Disconnect session at logon on only one profile

Hi,

We have an issue on Windows 2008 R2 server.

We logon by on a services account session to launch differents interactives batch. After some times (variable) session is disconnect automatically. And we can't back on this session by rdp, session is open correctly and disconnect immediatly.

I find in event viewer different information but without error, just directly disconnect.

Remote Desktop Services: User authentication succeeded:
User: MyaccountService
Domain: MyDomain

1/27/2014 8:23:58 AM

Remote Desktop Services: Session has been disconnected:
User: MyaccountService
Session ID: 4

1/27/2014 8:24:01 AM

To allow me to connect again by rdp on this session, i need to log off the session, and it will works for few hours.

In the same time, I could open a rpd session on all other account without any disconnection...

Could it be a limit on the video size memory which not allow us to see the session ? Limit on memory ? ...

Thanks for your help

Eric