After two months of fighting for a good sync , I have found the problem.
It was my Norton360 Internet security, see picture below where i disabled auto-protect.
Norton was continue scanning this file.
So i have placed the audio.tmp file in a location that is not scanned by the virusscanner.
See also this topic about. http://www.lightningradar.net/Discut/viewtopic.php?f=5&t=50
Now I am finaly a Happy LR user
This is a sync with LR Padergnone