This has been a problem since CF9.
Now that the CF Report Builder is deprecated and unsupported, there is no chance of it being fixed.
Unfortunately, the answer to your question is "you can't stop it."
Is there a work around?
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On Thu, Apr 7, 2016 at 1:23 PM, EddieLotter <email@example.com>
Bonni, restarting the Report Builder is currently the only work around.