Wipers clashing returning to parked position

[jhol78]

We have a frustrating problem with the wipers on our 2016 Galaxy.  They work fine except when the autowipe has been active and the ignition stopped before the blades have fully parked.  When switching the ignition back on the blades immediately return to the parked position without coordinating with each other, they cross over and invariably one of them breaks their plastic clip at the arm and flies off.  It is getting expensive!!  The dealer says there's nothing they can see that's wrong.  Thinking this is electronic rather than mechanical I replaced the wiper stalk with sender unit but it still happens.

I can't find anyone with a similar problem in the threads.  Does anyone have any ideas what may be the cause?

Thanks!