Also the same problem, after reboot and randomly, outgoing network traffic will be very solicited.
Server configuration :
Xeon e5 1650v2
RAID 1 - SSD
128 Gb RAM
Windows server 2012 R2 Datacenter
Server stats players :
http://www.gametracker.com/server_info/37.187.160.131:2302/
Bandwitch usage (Daily) :
http://my-url.fr/screen/300814231927.png