Triaging by data is just the first step. Once you decide it's an actual problem you have to be able to reproduce it. To confirm this is happening, you have to get production phones, then do an out-of-process rework, then do this for different OS versions, OS upgrade methods, iTunes version, etc... Reworking this sensor is not an easy task so you have to have someone do it for you and get their time, etc... It's actually a pretty big project to do this correctly.