Let me start off by saying that the people at Blackbird are great and their products are first rate. I always got very professional, timely, and informative responses to all of my questions. Also the Clara is a great sounding well made ukulele. I would not hesitate to recommend it to anyone.
The Clara I had was used and the soundboard had been repaired by Blackbird prior to my ownership. When I bought it, it had high action that I believed I could bring into an acceptable height, as I had done with other instruments. This one was a bit tougher but I got it to .090" at the 12th; but the neck just didn't look right and the playability was just not there. I took out a straight edge and the neck was bowed. The relief was .020" at the 6th fret. After a number of emails, it was surmised that the ukulele had probably been subjected to a high temperature. Blackbird offered to repair it at my cost, I was not the original owner and it was definitely not their fault....
I have no way to confirm that the ukulele was left in a car or some high temp environment, but the 180 degrees is doable in a car on a hot summer day. On a side note, anyone who has left a surfboard in a hot van or stored on an angle on the rafters can attest to how easily resin components and cloth can be impacted. As things turned out the soundboard repair didn't hold up and I ended up giving the ukulele away.
John