Stash become unresponsive with "Hazelcast instance is not active"

Caused by: com.hazelcast.core.HazelcastInstanceNotActiveException: Hazelcast instance is not active!
at com.hazelcast.spi.AbstractDistributedObject.getService(AbstractDistributedObject.java:93) ~[hazelcast-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at com.hazelcast.map.proxy.MapProxySupport.toData(MapProxySupport.java:1056) ~[hazelcast-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at com.hazelcast.map.proxy.MapProxyImpl.get(MapProxyImpl.java:83) ~[hazelcast-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at com.hazelcast.hibernate.distributed.IMapRegionCache.get(IMapRegionCache.java:75) ~[hazelcast-hibernate4-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at com.hazelcast.hibernate.access.AbstractAccessDelegate.get(AbstractAccessDelegate.java:85) ~[hazelcast-hibernate4-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at com.hazelcast.hibernate.region.EntityRegionAccessStrategyAdapter.get(EntityRegionAccessStrategyAdapter.java:56) ~[hazelcast-hibernate4-3.3.1-atlassian-10.jar:3.3.1-atlassian-10]
at org.hibernate.engine.internal.CacheHelper.fromSharedCache(CacheHelper.java:55) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
at org.hibernate.engine.internal.CacheHelper.fromSharedCache(CacheHelper.java:67) ~[hibernate-core-4.3.6.Final.jar:4.3.6.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:598)
.....
at com.atlassian.activeobjects.internal.AbstractLoggingTransactionManager.doInTransaction(AbstractLoggingTransactionManager.java:19) ~[na:na]
at com.atlassian.activeobjects.internal.EntityManagedActiveObjects.executeInTransaction(EntityManagedActiveObjects.java:276) ~[na:na]
at com.atlassian.activeobjects.osgi.TenantAwareActiveObjects.executeInTransaction(TenantAwareActiveObjects.java:383) ~[na:na]
at com.atlassian.stash.internal.key.ssh.DefaultSshKeyService.getByPublicKey(DefaultSshKeyService.java:154) ~[na:na]
at com.atlassian.stash.internal.ssh.server.DefaultPublicKeyAuthenticator$1.call(DefaultPublicKeyAuthenticator.java:84) ~[na:na]
at com.atlassian.stash.internal.ssh.server.DefaultPublicKeyAuthenticator$1.call(DefaultPublicKeyAuthenticator.java:75) ~[na:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_75]
... 3 common frames omitted
2015-04-02 18:51:31,865 WARN [AtlassianEvent::thread-7] c.a.a.c.c.AnalyticsConfig Couldn't check the analytics settings. This can safely be ignored during plugin shutdown. Detail: Hazelcast instance is not active!

java.lang.OutOfMemoryError: PermGen space

java.lang.OutOfMemoryError: GC overhead limit exceeded