Has a piece of equipment ever failed in the field, and actually cost you a deer?

Do tell.
__________________________________________________ _____

Personally, I've been cost three bucks by complete equipment failure in 14 years:

First, I had an HHAsight bracket slide about 1" out of position afterthe set screw came loose. I missed a 4x4 buck two times at 13and 17 yards before he finally spooked. I think I missed him by 3 feet each time. Only after inspection afterwarddid I find that the sight had moved. I bought a new sight the following day.

Second, I had a first-generation Beman carbon-wrap arrow blow up in the bow on a shot on a 3x3 buck (ICS I think). Maybe the arrow was damaged before I shot, who knows? Immediately switched back to aluminum shafts. (I have since regained faith in carbon arrows).

Third, I put a perfect spine shot on a 4x4 buck at 5 yards at 76# with a Triska SK 125 broadhead. At impact, the broadhead completely failed, bending the ferrule into a curly-Q, breaking the blades. The broadhead failed to penetrate the spinal column, and looked like it had been fired into a concreteblock wall. I immediately switched to a stouter, chisel-tip broadhead, and for all I know, that buck is still running. That was a pretty bad feeling. I had that buck tagged and at the taxidermist before the arrow ever hit him. So much for that idea.