I've tried something similar with our internal wallboards, and have seen similar problems over time. I would double-check your base URL just to be sure there's not any problem there, but I suspect you'll need something like the JIRA wallboard plugin to make this work:
That should give you a predictable URL for its servlet and if you make a dashboard with only one column and gadget, the effect should be similar to putting a single gadget in an iframe.
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