~
I've had a Parabellum medium screen on my 2012 Super Tenere for over 36,000 of the bike's more than 40,000 miles and it's never done that to my instrument cluster. And just for the record, I live in South Texas where we get lots of sun, it's more often fierce and brutally hot and bright, and my bike certainly has been out in that South Texas sun a ton in the nearly 3 years I've owned the motorcycle.
You're also in Texas, so you know what I mean about the sun in our state.
I'm sure the 'screen could act as a lens and do that, but like I said, it's never done it on mine. Do you park the bike in the same place every day, say on the sidestand (I usually park mine on the centerstand if possible), with the bike out in strong sun all day?
I'll bet Yamaha will cover that under warranty.
Dallara
~