TECH36087 discusses an issue where netbios resolution is... off somewhow and these are the suggestions:
- Ensure NS is able to resolve the NETBIOS name of the domain.
- Specify the name of the domain under the AD import rule. (instead FQDN of the Domain Controller)
TECH14331 discusses an issue that deals with only virtual machines and how to stop this issue. The discussion and resolution is too difficult to include here.
Finally, because I can't find it, make sure you're at least at R11 if you can. R13 is current and you don't want to be way behind on patches if you find yourself having to call support.
Let us know please what works!