Assistant suddenly stops in the middle of a conv

I'm playing with the prompt for the assistant.

I'm onto a version 4 of the prompt, trying to improve it each time, and make it like talking to a real human.

It started well, but the assistant suddenly stoped saying anything, at around 3 minutes...
and even after me trying to relaunch the conversation flow.

Where should I look into, to solve those kind of unexpected bug ?

It seems to me very unreliable, since the script was perfectly executed thus far.
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