Your question is Owning an Ambiguous Bus Failure. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you had to lead the investigation of an intermittent embedded communication failure, like SPI or I2C not working reliably, when the root cause was unclear. How did you structure the debugging effort, align others around your approach, and what was the outcome?