I can’t bee-lieve this happened!

Ugly. Bags. Of mostly. Water

If it only happens under load, that would make me suspect the motor driver. It sounds like the circuitry isn’t able to handle much current anymore, which would cause it to basically lock itself out for safety, until it’s power cycled. Most likely such a scenario isn’t communicated to the display.

I’m definitely no expert but I’ve owned a mid drive for a few years. It could possibly be the nylon gears transferring power from the motor to the bike’s gears- that happened to me early on. I’d go full throttle from a dead stop and eventually the gears sheared and binded.

Otherwise, depending on the actual sound it could be the driver fets or the motor itself. Can you post a short video or audio clip of it happening? Also does it only happen under load or can you trigger it with the back wheel off the ground?