I have a Gazelle Arroyo C5 and the gear shifter is WAAAY stiffer than usual and is causing tendonitis.

I have one Arroyo in the east and one in the west. Started with a Townie Go! and sold it to buy the second Arroyo. I absolutely love it! But the shifter is giving me trouble. It's really stiff compared to my bike at home. I've take it in and they tried to adjust it, but it's still too stiff and now it's in the shop for a warranty repair to replace the cable. And it has totally flared up some tendonitis in my right wrist. Has anyone had that problem with the newer Gazelle's or is it due to how it was assembled?