I never had any problems with Server 10.2.2. But after installing 10.3 on my test server, performance has gone right down the toilet. My feature services hang up, and if I stop a feature service, it won't restart. Stopping and restarting the actual ArcGIS Server service puts everything into permanent stopping mode. Once things start acting up , the only way I can clear it out again is to reboot the server. Has anyone else seen this problem?