It was actually customer's fault 3/4 times. Already proven by Steve (Gamers Nexus). Granted that the design could be better like make one of the sense pins shorter so it doesn't make a contact unless connector is shoved in properly and latched. Either way, I know people who are scared of using any kind of force with computer components, people who are scared to push hard on the RAM to make it sit properly, and believe it or not there are majority of them. Also the failure rate was 0.04% which was very minor and can be co-related with the fact that it's mostly user-error and not a design defect.