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It is likely that this is a current limit of Alfresco. See more details at https://issues.alfresco.com/jira/browse/ALF-1518Good news is it was fixed. Bad news is the fix has not been merged to the public repos, in case you want to roll out the fix by yourself.
export JAVA_OPTS="-XX:MaxPermSize=512m -Xms128m -Xmx768m -Dalfresco.home=/opt/Alfresco -Dcom.sun.management.jmxremote"
export JAVA_OPTS=" -Dhttp.proxyHost=xxx.25.254.9 -Dhttp.proxyPort=8000 -XX:MaxPermSize=512m -Xms128m -Xmx768m -Dalfresco.home=/opt/Alfresco -Dcom.sun.management.jmxremote"