I am on my 4th failed Adafruit Circuit playground, I can usualy program them a few times, like less than 10, then they become unresponsive. no amount of reseting, rebooting, bootloader re-installations, etc seem to help. I am using Arduino 1.8.1, on a linux platform, running on a Lenovo T510.
I have numerous other MCUs that have never failed... Im just curious why there is such a high failure rate with the circuit playgrounds I am getting.