Agilent 8453 Problem with a HP 89052B Sipper running different direction randomly

I have a GMP Agilent 8453 UV-Vis (F/W A.03.90) with a HP 89052B Sipper attached via UV-Vis Chemstation B.05.04.
Randomly while running a sequence the sipper will run in the opposite direction to that specified in the method. This has happened at random points in several runs.
The on-screen sipper icon in Chemstation shows the correct direction of rotation.
Not direction specific. It happens when the method is set to clockwise or anti-clockwise.
This also has been seen when selecting the direction manually through Chemstation.

Have any of you seen this problem before? Any idea why?

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