One aspect I am not sure has been mentioned is not having your downhill ski fully weighted.
If you have no or little weight on your ski in the belly there is a good chance the ski is going to ping off.
I do believe technique is a fairly large component of skis pinging off.
There are some folks who seem to release when they do not want to more consistently than others.
Smooth skiers bindings don't seem to release release unexpectedly.
this is similar to folks who bend skis.
I knew a reasonably small gal of about 115 lbs. who bent skis regularly.
When my son was a J3 he bent 7 pair in one season! go figure.
Hardware failure is one thing, Software issues I believe happen more often than realized.
Edited by Atomicman - 3/8/13 at 1:17pm