Scooter reliability?

Just wondering, burn time aside, what is the probability of a scooter failure with my new N 19 Silent Submerge?

I have completed my scooter class and got great mentoring on how to calculate how far I can safely penetrate a cave on a scooter and still be able to swim out given my sac rate and swim rate. So this is not a question of procedure or whether I should risk violating any standards.

I guess we could start a poll? For those that have a robust cave scooter purchased in the last 5 years (please let’s not get lost in exactly what is a robust cave scooter), how many have experienced a scooter failure that was not related to battery burn time.

Thanks,
dean