Unhandled Exception "Could not find any available Domain Controller"

Hi,

I keep on having exchange 2010 loosing contact to domain controllers.

"Unhandled Exception "Could not find any available Domain Controller.". EventID 1. Once I restart the sever, this error disappear and reappear again after a few days.

When I run AD setting, the result shows as below. Update version is currently as at 14.02.0342.003. And boths DCs have 100% uptime.

PS C:\> Get-ADServerSettings | fl

RunspaceId                                : 9392eb25-bcdc-462e-816b-2d5626c572a5

DefaultGlobalCatalog                      : DC2.com.au

PreferredDomainControllerForDomain        : {}

DefaultConfigurationDomainController      : dc1.com.au

DefaultPreferredDomainControllers         : {DC2.com.au}

UserPreferredGlobalCatalog                :

UserPreferredConfigurationDomainController :

UserPreferredDomainControllers            : {}

RecipientViewRoot                         :

ViewEntireForest                          : True

WriteOriginatingChangeTimestamp           : False

WriteShadowProperties                     : False

Identity                                  :

IsValid                                   : True

Could you please help as this exchange server has our management team and their outlook keep on going offline.

Thanking you in advance.

Cheers,

Pwint