Rhodes Chroma Polaris

Hi, New Chroma Polaris user, and I've got a problem, wondering if any of you have an idea. 

I get random Pitch bend drift, like the following:

11:53:37.336	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-1408
11:53:37.359	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-1152
11:53:37.696	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-896
11:53:37.718	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-768
11:53:37.730	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-640
11:53:38.099	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-512
11:53:38.258	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-896
11:53:38.437	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-1024
11:53:38.449	From MIDISPORT 2x2 Port B	Pitch Wheel	1	-1152

I've replaced the pitch bend and modulation pots, with no luck, and tried a different MIDI interface. I've recalibrated the pitch and mod levers with no luck.

It seems to go away for a bit if I reset the Polaris, but eventually starts drifting again in spurts if I use the pitch level. I can workaround by setting the Pitch Bend Lever range to zero, but then I miss out on the pedal steel pitch bend fun.

Any ideas?

Jesse