lib/lp/soyuz/javascript/tests/test_lp_dynamic_dom_updater.html fails rarely/intermittently in parallel tests

This is the test list for worker 1: http://pastebin.ubuntu.com/976501/

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FAILURE: lib/lp/soyuz/javascript/tests/test_lp_dynamic_dom_updater.html
worker ID: worker-1
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Traceback (most recent call last):
_StringException: Traceback (most recent call last):
  File "/var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/testing/__init__.py", line 1021, in checkResults
    self.assertEqual([], failures, '\n'.join(failures))
MismatchError: !=:
reference = []
actual = ['Failure in /var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/soyuz/javascript/tests/test_lp_dynamic_dom_updater.html.dynamic_dom_updater.test_actual_never_less_than_original_interval: Actual interval never goes below config interval.\nExpected: 10 (number)\nActual: 32 (number)']
: Failure in /var/lib/buildbot/slaves/slave/lucid-devel/build/lib/lp/soyuz/javascript/tests/test_lp_dynamic_dom_updater.html.dynamic_dom_updater.test_actual_never_less_than_original_interval: Actual interval never goes below config interval.
Expected: 10 (number)
Actual: 32 (number)