I have leg cramps/muscle contraction during therapy, or muscle soreness after use.

Confirm that the intensity is appropriate – strong but comfortable. You can recalibrate if necessary. You may also want to decrease the intensity, as long as it remains strong.
Try the other leg. One leg may be more prone to cramping or soreness than the other leg.
Reposition the device to minimize the amount of electrode on the back of the calf. This usually means positioning the device on the inside or outside rotated towards the front (but not on top of the shin (tibia) bone).
If you mostly have cramping/soreness when lying down, make sure that the device is not positioned You can also enable the Body Position Adjustment feature to automatically compensate while laying down. This is located under Therapy Automation under Settings.

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