Alfresco completely freezing on trying to empty trashcan

Hi,

I have an Alfresco instance that becomes completely unresponsive when trying to empty trash can via Alfresco share.
Both retrieving content that should be selected for deletion or simply clicking on Empty freezes the content.

Version is 5.0.2 on Windows Server 2012 R2.
Tomcat maxThreads=150
db connections is 275
SOLR is running on the same tomcat instance

javamelody & threaddump attached

16GB of RAM is available on the server

Java options:

-XX:+DisableExplicitGC
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC
-XX:ReservedCodeCacheSize=128m
-Djava.awt.headless=true
-Dalfresco.home=D:\Alfresco
-Dcom.sun.management.jmxremote
-Dhazelcast.jmx=true
-XX:MaxPermSize=512M
-Xms8G
-Xmx10G