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.