But then it failed completely and got stuck in the open position. Functionally this really isn't a big deal but it still needs to be repaired. Jag USA says they've seen "a couple" such failures in North America and that repair requires partial disassembly of the dashboard.
Mine is going in for repairs in November.
If yours is not quite perfect it might be en route to failure since maybe it's rubbing on something etc and is getting stressed, or has a faulty motor.