After more than two years without issues, we recently had the first major mechanical failure with our Solo-12 here at LAAS-CNRS. During the usual demo that we show to visitors or for public events, the leg suddenly broke near the shoulder. It was a classic walk on flat ground so I guess it is due to mechanical stress on the plastic over time. Note the small crack near the screw on the top picture (we have similar ones, albeit smaller, for almost all screws on the legs).
I have made a directory with several close-up pictures for those of you who like to see broken parts