"Managed Domains" question/issue

hi,

i have question about status of "managed domain".

the parameter is set to "any available domain controller in the site:", the site contains 2 domain controllers.

in run cycle, managed domain status is "available for management".

but, in some cases (domain controller becomes unavaliable for exemple...) the status changes to "... not available for management" and stay on this status until i restart the admin service.

and although the domain is managed, because i can create or delete directory objects without any problem.

any idea about this ?

thanks for all