Erratic inputs can be caused by a couple of things. Anything metallic that's not where it should be around the sensors will throw it off. Rare, but I was helping a guy on the VKB forums recently with the same kind of problem and he found a washer behind one of the PCBs! Was stuck to the magnet. That was kind of obvious but any little bit of metal will throw it off.
More likely it's a loose connection. The sensors are super precise but need a smooth signal. Open up the base and check the little white wire connectors that are plugged into the PCBs. Unplug and plug them back in. When plugging them back in make sure none of the individual wires look like they're coming out of the connector. They're tiny and might not be seated in the connector properly. If one is loose just push it in til it clicks. They're so small you'll more feel it than hear it. Then put the connector back on. Once back together you'll have to recalibrate.
There have been other instances of broken wires but that's rare too. I figure this might be the only weak spot on these sticks. Better, sturdy gimbal. Sensors are way more precise. But until somebody comes up with a magical way of connecting the moving gimbal to the electronics without wires that's gonna have to do.
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