I have a 'setup' job that I poll in my test job using the BRT plugin. Sometimes it works (from BRT polling log):

Polling started on Nov 19, 2013 6:11:23 PM
Polling for the job FrameworkTests
Checking changes for job Setup.
Checking expected job build results for the job Setup.
Checking SUCCESS
Last build result for the job Setup matches the expected result SUCCESS.
Job Setup is modified. Triggering a new build.

Polling complete. Took 0 ms.
Changes found. Scheduling a build.

But sometimes, even though the Setup job ran recently, it still doesn't spark the FrameworkTests:

Polling started on Nov 20, 2013 6:11:23 PM
Polling for the job FrameworkTests
Recording context. Check changes in next poll.

Polling complete. Took 1 ms.
No changes.

Any reason why this would be intermittent?