Agent sporadically not responding

I have an agent set up and seemingly working OK. Except for the fact that sometimes - actually very often, probably 40% of the time - it doesn't respond when people answer its questions.

It's not a noise issue. And I've tried with and without background noise reduction.

I can say "YES" very clearly and loudly and it says nothing. I'll repeat and nothing. I'll then say "CAN'T YOU HEAR ME!? I SAID YES!!!" and finally it might respond, apologising.

And it's happening to multiple people on our team who are testing it, with different voices, responses, phones, environments, so it's not just me.

Is there a checklist of things that might be causing this kind of behaviour? It only seems to happen on actual calls it makes to a phone, not when testing in the browser.

I'm using Google Gemini 2.0 Flash for model and transcriber - this is the only setup where it doesn't just randomly hang up on me.
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