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Thanks for your help on this.
We weren’t able to recreate the issue you were seeing with the parts that we had around here, but once we got the motors in from Adafruit we got to the bottom of it. Those little guys appear to throw off a lot of EMI and it is getting into the reset line. I’m pretty sure this would be the same regardless of whether you have an XLR8 or Uno. The difference is the Uno has a 2.5us filter on its reset input (sections 1.1.5 and table 29-11 of the Atmel ATmega328 chip spec) and we missed that in our design. One of the cool things about XLR8 is that we can fix things like this. I’ll have a new board package on our website tomorrow that you’ll be able to use to update your board and resolve the issue.