[Samba] Samba AD Debug Login Script / Sometimes Network drive not connected

[basti]

Hello,

I have migrate my samba NT4 Domain to AD. There are 2 DC for failover.
Sysvol is synced with rsync.

Sometimes the network drive is not connected on userlogin. A manual
start of login script or relogin do solve that problem.

Did someone know whats wrong there?
How can I debug the login process?
There is no command window like on windows nt4 domain login process.
Clients are Windows 7.


Best Regards,
Basti