We use HKObserverQuery, and the background monitoring / launch feature of HealthKit framework. We're experiencing thousand of NO_CRASH_LOG crashes like the one described in this thread, where if you open a .crash file it shows just a couple of dyld calls and then EXC_CORPSE_NOTIFY with a system watchdog killing the app during launch after 1 minute of inactivity. Can that be related to HealthKit or some other libs (loading code) ?