My guess is that you are talking about this failure[1]. Looking at the Sauce Labs screencast, it looks to me that labs was just slow to respond and the test failed after 5 seconds with pretty descriptive error message[2]. It is hard for me to say why labs is slow. As Antoine has suggested, looking at logs for that date/time could help.

If that happens a lot, a short workaround would be to make the test wait for 10 seconds instead of 5.

Željko
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1: https://integration.wikimedia.org/ci/view/BrowserTests/job/browsertests-MobileFrontend-en.m.wikipedia.beta.wmflabs.org-linux-chrome-sauce/55/testReport/junit/(root)/Wikitext%20Editor%20(TEST%20RUN%20ON%20WIKIPEDIA%20SO%20SHOULD%20NOT%20CAUSE%20SAVES)/Opening_editor/

2: timed out after 5 seconds, waiting for {:css=>".wikitext-editor", :tag_name=>"textarea"} to become present (Watir::Wait::TimeoutError)