Having never heard of a "CYPRES fire," just spent 10 minutes googling it and then watching terrifying skydiving videos, like this one (no injuries or deaths, just scary):
By far the most 'well known' AAD videos.
The human mind is amazing in its ability to adapt to new environments. To a non-skydiver, the most important thing to do when you skydive is to open your parachute.
However it's stupidly easy as a jumper to forget completely about your altitude because you're concentrating on something else. Hard to believe that you're able to easily ignore 'certain death' after a few times - but that's the case.
According to CYPRES documentation, they've had thousands of fires - so in theory - saved thousands of lives - including the ones in this video. Pretty impressive.
I'm being cynical. The occasional misfire is worth every life saved. I suppose that AAD systems are like airbags. An occasional false positive is better than even a single false negative.
Older jumpers at my drop zone used to tell the legend of the South African Three Way. Seems that in the early days of RW, three jumpers were jumping all day long trying to get the first 3-way formation in South Africa. They succeeded, as proven by the position their bodies were in when they found them.
https://www.youtube.com/watch?v=DAZXF1UZ1Yg