FULL PRODUCT VERSION :
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b30)
Java HotSpot(TM) Client VM (build 24.51-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer 11
Version: 11.0.9600.18524
Update Versions: 11.0.37 (KB3197655)
Product ID: 00150-20000-00003-AA459

A DESCRIPTION OF THE PROBLEM :
Applet crash due to some Java internal exception sometime (Please refer to the Error Message provided.)
Frequency is around 5 cases per day. (In 1000 active users daily)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at sun.plugin2.message.Queue.waitForMessage(Unknown Source)
at sun.plugin2.message.Pipe$1.run(Unknown Source)
at com.sun.deploy.util.Waiter$1.wait(Unknown Source)
at com.sun.deploy.util.Waiter.runAndWait(Unknown Source)
at sun.plugin2.message.Pipe.receive(Unknown Source)
at sun.plugin2.main.client.PluginMain.mainLoop(Unknown Source)
at sun.plugin2.main.client.PluginMain.run(Unknown Source)
at sun.plugin2.main.client.PluginMain.main(Unknown Source)
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at sun.plugin2.message.Queue.waitForMessage(Unknown Source)
at sun.plugin2.message.Pipe$2.run(Unknown Source)
at com.sun.deploy.util.Waiter$1.wait(Unknown Source)
at com.sun.deploy.util.Waiter.runAndWait(Unknown Source)
at sun.plugin2.message.Pipe.receive(Unknown Source)
at sun.plugin2.main.server.HeartbeatThread.run(Unknown Source)
Exception in thread "JVM[id=1]-Heartbeat" java.lang.NullPointerException
at java.net.URLClassLoader.close(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.close(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoaderCache.shutdown(Unknown Source)
at sun.plugin2.main.client.PluginMain.exit(Unknown Source)
at sun.plugin2.main.client.PluginMain$Heartbeat.handleStop(Unknown Source)
at sun.plugin2.main.server.HeartbeatThread.run(Unknown Source)

REPRODUCIBILITY :
This bug can be reproduced rarely.