Pentax 645z triggers Elinchrom quadra Pro head only once in HSS

My Pentax 645z with V6II and the latest Pentax firmware triggers my Elinchrom Quadra hybrid (with a Pro head and a V6II with sync cable) only once in HSS mode when I go beyond the sync speed. The next frame I shoot the flash doesn't fire. I have to push a button on the V6ii or mess about in the menu to get the flash to fire again. No problem when I use the sync speed, the camera triggers the flash frame after frame.
Any idea how to solve this?


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