intermittent failures on saucelabs

[timoxley]

Error: [init({"browserName":"chrome","platform":"MAC","javascriptEnabled":true,"takeScreenshot":true})] The environment you requested was unavailable.

{ data: '{"status": 13, "sessionId": "7d9192e9ec074e119be877c00ec407d0", "value": {"message": "unknown error: cannot find Chrome binary\\n  (Driver info: chromedriver=2.11.298611 (d1120fdf51badec2f7b63a96e19a58d4783de84d),platform=Mac OS X 10.6.8 x86_64)", "webdriver.remote.sessionid": "7d9192e9ec074e119be877c00ec407d0", "hasMetadata": true}}' }

Seem to get this error intermittently while trying to run the saucelabs tests. Suspect it doesn't like constantly starting and stopping the browser.