samba - May 2005 - Problem in Samba about Not Enough Server Storage Available

Hi Samba Lovers 
I am facing the following problem is some one can help?

while try to access share as Domain user on Samba Server i am facing
the following error message.

Problem 1 
The Network Computers are appearing and disappearing 
I tried to change local master = no and set OS Level = 75 

Problem 2

"Domain" not accessible, You Might not have permissions to use this
network resource. Contact the Administration of this server to find
out if you have permissions.
Not enough server storage is available to process this command.

I will appreciate if some one can help 

Regards

Tipu