http://support.microsoft.com/en-us/kb/2520155
We do allow dynamic DNS updates but about 10% failed to register after the recovery and 20% or more failed on the way back.
There might be a Microsoft DNS client hotfix for this issue but it was published in 2011. So I would have think this would have been fixed by now!
I have no idea why the editor insisted on pasting the link at the top of the message!