Checking the error.log that AEM uses, we found the following warning:
error.log:19.10.2016 08:38:23.257 *WARN* [172.19.51.17  POST /content/phonegap/ambassador-app/main/jcr:content/pge-app/app-config.activateZips.json HTTP/1.1] org.apache.jackrabbit.oak.jcr.session.ItemImpl Item#refresh invokes Session#refresh!
No stacktrace was logged, so we do not have enough information to determine what is the root cause.
Does anyone have any insights about it?
It seems that happens when we try to "Stage Updates".