Please, perform a firmware update as described in the FAQ. This fixes issues with the encoders, especially when the left one from the group of four encoders under the matrix behaves strangely.

If this doesn’t help and if your device is older, the encoders have to be replaced. Please contact our support team via the form in the upper right corner.

Do not apply contact cleaner or similar agents to the encoders. This will not solve the issue for good and you risk damaging your device.