In one clip, a customer seemingly crashed the system by ordering 18,000 water cups, while in another a person got increasingly angry as the AI repeatedly asked him to add more drinks to his order.
Since 2023, the fast-food chain has introduced the technology at over 500 locations in the US, with the aim of reducing mistakes and speeding up orders.
But the AI seems to have served up the complete opposite.
CTO Dan Mathews said the firm was "learning a lot" - but he would now think carefully about where to use AI going forwards, including not using it at drive-throughs.
In particular, Mr Matthews said, there are times when humans are better placed to take orders, especially when the restaurants get busy.
"We'll help coach teams on when to use voice AI and when it's better to monitor or step in," he said.
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