CRM 2016 - The RPC server is unavailable.

Hi, We are implementing CRM 2016,

We are having a problem, our server return a IIS error with the text below:

But if we wait for some minutes the application comeback to work without any intervention and without IIS generates another w3wp process.

Any help? Any direction to investigate?

Thanks

Augusto César - MCSE nt4.0 W2K W2K3 W2012 MCT

 3005
   An unhandled exception has occurred.
   17/08/2016 14:24:31
   17/08/2016 17:24:31
   80b74e1dd5ff401db04f5e9a9e180a75
   1262
   1
   0
   /LM/W3SVC/2/ROOT-1-131158408162269572
   Full
   /
   C:\Program Files\Microsoft Dynamics CRM\CRMWeb\
   MYCORPVMG020
    
   3928
   w3wp.exe
   NT AUTHORITY\NETWORK SERVICE
   COMException
   The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) at Microsoft.Crm.Tools.ActiveDsWrapper.NameTranslateClass.Init(Int32 lnSetType, String bstrADsPath) at Microsoft.Crm.ADNameUtility.Rfc1779NameFromGuid(Guid guid) at Microsoft.Crm.SecurityUtils.BuildLdapPath(Guid adGuid) at Microsoft.Crm.SecurityUtils.CheckMembership(Guid principalId, Guid groupId) at Microsoft.Crm.Caching.OrganizationSettingsCacheLoader.LoadCacheData(Guid key, ExecutionContext context)  
   mycorpvmg020/.../LookupMruWebService.asmx
   /MYCORPDev/AppWebServices/LookupMruWebService.asmx
   10.100.1.111
   GRUPOMYCORP\CRMInstall
   True
   Negotiate
   NT AUTHORITY\NETWORK SERVICE
   23
   NT AUTHORITY\NETWORK SERVICE
   False
   at Microsoft.Crm.Tools.ActiveDsWrapper.NameTranslateClass.Init(Int32 lnSetType,