[adzm]

Does the temperature of the track change much after thirty minutes?

[WillMorr]

I haven't actually measured it but that's a good thought, I may borrow a thermal camera and do some testing! It's not noticeably warm to the touch but this functionally a system that converts potential energy into heat and sound so there's probably a measurable change.

[4gotunameagain]

Good thinking! Although I think that would result in a change of the failure rate, whereas in this case it appears to be constant.