I am using ArcGIS Server 10.2.
I published a lot services for geoprocessing. Most of them are the long running services. Those services manipulate data but user do not wait for the results. When I use REST Submit Job in the web browser sometimes it works without errors, but more often my processes are cancelled. In the web browser I get esriJobMessageTypeInformative that the service was canceled and aborted by User. This is very annoying behavior because I cannot find the reason of this state. Another strange thing is a time of canceling. There is no rule when the process is aborted, sometimes after 4 hours, sometimes after 45 min. This is not the problem with pooling because I have never reached any of maximum times.
How do I solve this?