Problems with JollyNinja

I noticed that JollyNinja is getting unusually bad results in the latest battles it has run (it currently votes for Quantum, which it really shouldn't be!)

[https://literumble.appspot.com/BotDetails?game=meleerumble&name=sgp.JollyNinja%203.53&order=-KNNPBI JollyNinja's results on LiteRumble]

When I run battles locally I get the following warnings:

SYSTEM: Warning: sgp.JollyNinja uses static reference to a robot with the following field(s):<br>
	sgp.JollyNinja.instance, which points to a sgp.JollyNinja<br>
	sgp.Environment.robot, which points to a robocode.AdvancedRobot<br>
SYSTEM: Static references to robots can cause unwanted behaviour with the robot using these.<br>
SYSTEM: Please change static robot references to non-static references and recompile the robot.<br>

When I run battles on a 1.9.4.2 client I see the poor performance seen in the rumble but with 1.9.5.2 the performance looks to be okay.