One wheel is being replaced after the 600 mile service on my '18 GS. Not clear if these are defective wheels, and once replaced will not see this issue again, or, if this is going to be a regular issue from now on because the wheel design is faulty. Since this wasn't an issue with the 17s, I'm banking that the wheels were cocked up in manufacture, and once replaced will be fine. No excuse for spoked wheels to come loose within a 600 mile interval of on road use.
I'll update once I get back Stateside and get my new wheel. I've got an excellent service rep who should give me the straight story.
2010 Ducati 696 Monster