I am sure it is unrelated, but I was getting 'Error 701 FileMaker Script Engine process has terminated abnormally' errors after upgrading to FMS15.
They were also occurring seemingly randomly.
In my case, it turned out to be an outdated plugin that was being called by scripts (in PSOS settings). When a script was called that used the plugin, the Script Engine terminated.
Updating the plugin fixed this for me.
Are you using any server side plugins?
No , I am not using Serverside plugins. But clientside yes . I use BaseElement plugin to move file and call WebAPI.
This isn't the script engine dying but the db engine.
Update to v3 of FMS15. Also, I'm assuming that this is Windows 2012R2, not just 2012?
Yes , its 2012R2. Could you please explain why we should update to v3 of FM15 ?
Because it is the most recent version so it contains bug fixes that are not in v1 or v2.