REST service stopped spontaneously

Infrequently (twice recently), REST services seem to stop for no apparent reason. How do I get to the bottom of this?

I’m running OH 1.8.1 on Fedora 24

2016-11-10 18:24:20.328 [INFO ] [] - Stopped HABmin REST API
2016-11-10 18:24:24.403 [INFO ] [] - Stopped REST API
2016-11-10 18:24:24.412 [INFO ] [] - Stopped CometVisu API
2016-11-10 18:24:29.009 [INFO ] [.service.AbstractActiveService] - XBMC Refresh Service has been started
2016-11-10 18:24:33.576 [INFO ] [.service.AbstractActiveService] - XBMC Refresh Service has been shut down

This happened again today. Stopped REST API shows up in the log, but no sense of what might have stopped it. This breaks the Android and iOS apps, our primary access to OH; I’d like to restart the API without a complete OH restart if possible.