SAP EP7 NW2004s (sp12) unexpected shutdowns

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Since last friday we experience very strange behaviour of out development portal.

It now happens almost every 30 minutes and we are getting a bit desperate.

The error log is not very descriptive (as usual) so hopefully someone can point us in the right direction.

#1.5 #00096BCE1029006B0000003E0001D08200043DF3E0846AE1#1194017559963#com.sap.portal.prt.runtime.broker#sap.com/irj#com.sap.portal.prt.runtime.broker#Guest#0####d837dfa0895811dcc7c700096bce1029#SAPEngine_Application_Thread[impl:3]_8##0#0#Error#1#/System/Server#Java###[PortalServiceItem.release] exception caught releasing com.sap.netweaver.coll.appl.rtc|RTCClientPollingService

[EXCEPTION]

#1#java.lang.NullPointerException at com.sap.ip.collaboration.core.api.rtmf.core.RTMFMessaging.unsubscribe(RTMFMessaging.java:1040) at com.sap.ip.collaboration.core.api.rtmf.core.cluster.ClusterSystemManager.unsubscribe(ClusterSystemManager.java:133) at com.sap.ip.collaboration.core.api.semantic.services.RTCBaseService.destroy(RTCBaseService.java:146) at com.sapportals.portal.prt.core.broker.PortalServiceItem.release(PortalServiceItem.java:389) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1159) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156) at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476) at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194) at com.sapportals.portal.prt.core.broker.PortalAppBroker.releaseAllItems(PortalAppBroker.java:568) at com.sapportals.portal.prt.core.broker.PortalAppBroker.shutdown(PortalAppBroker.java:672) at com.sapportals.portal.prt.runtime.Portal.shutdown(Portal.java:722) at com.sapportals.portal.prt.core.PortalCoreInitializer.shutdown(PortalCoreInitializer.java:111) at com.sapportals.portal.prt.dispatcher.PortalInitializer.shutdown(PortalInitializer.java:164) at com.sapportals.portal.prt.dispatcher.Dispatcher.destroy(Dispatcher.java:581) at com.sap.engine.services.servlets_jsp.server.runtime.context.WebComponents.destroyServlets(WebComponents.java:722) at com.sap.engine.services.servlets_jsp.server.container.ApplicationThreadDestroyer.run(ApplicationThreadDestroyer.java:62) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(AccessController.java:215) at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170) # #1.5 #00096BCE1029006B000000400001D08200043DF3E0847234#1194017559965#com.sap.portal.prt.runtime.broker#sap.com/irj#com.sap.portal.prt.runtime.broker#Guest#0####d837dfa0895811dcc7c700096bce1029#SAPEngine_Application_Thread[impl:3]_8##0#0#Error#1#/System/Server#Java###[PortalServiceItem.release] exception caught releasing com.sap.netweaver.coll.appl.rtc|collaboration_connector_awareness [EXCEPTION] #1#java.lang.NullPointerException

at com.sap.ip.collaboration.core.api.rtmf.core.RTMFMessaging.unsubscribe(RTMFMessaging.java:1040)

at com.sap.ip.collaboration.core.api.rtmf.core.cluster.ClusterSystemManager.unsubscribe(ClusterSystemManager.java:133)

at com.sap.ip.collaboration.core.api.semantic.services.RTCBaseService.destroy(RTCBaseService.java:146)

at com.sapportals.portal.prt.core.broker.PortalServiceItem.release(PortalServiceItem.java:389)

at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223)

at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1159)

at com.sapportals.portal.prt.core.broker.ApplicationItem.release(ApplicationItem.java:476)

at com.sapportals.portal.prt.core.broker.PortalApplicationItem.release(PortalApplicationItem.java:1194)

at com.sapportals.portal.prt.core.broker.ApplicationItem.releaseDependents(ApplicationItem.java:223)

at com.sapportals.portal.prt.core.broker.PortalApplicationItem.releaseDependents(PortalApplicationItem.java:1156)