Most likely a current issue... those motors can run up to 5-10A @ 5v or so. Also, probably not the cause of the issue, but as a general reminder, don't forget to connect all your grounds!
Most likely a current issue... those motors can run up to 5-10A @ 5v or so. Also, probably not the cause of the issue, but as a general reminder, don't forget to connect all your grounds!