It happens every second or third time whenever I open the roof, the cover will come down ok, but sit about 1/2" high on one side. Sometimes I can partially open then close the roof and it will settle flush, but not always.

Is there a reset I can do to correct this, or is it a dealer visit?

I'd take a photo but it's night and the car's outside while I'm having the garage floor recoated.

 

The latch on that side is not locking down

 

Off to the dealer then!

 

Just as a followup, before getting the dealer involved I left the roof down for a day, drove round a bit and it fixed itself! It is now flush and almost perfect.

So the urgency is gone, but I will have to get it professionally sorted at some time. Now waiting to see if the fix will repeat itself.