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We have an issue within our main app and it's quite frustrating as we now can't promote them as planned and first have to figure out a workaround for this issue or wait for a solution. ARKit Bug: ARKit causes the dispatch queue(default-qos) to stop working. I have a simple code to simulate this scene. In the official ARKit demo. https://github.com/titman/arkit-14_2_bug/tree/master/arkit-by-example When using [CMMotionManager startDeviceMotionUpdatesUsingReferenceFrame:toQueue:withHandler:] method to open sensor monitor, and deviceMotionUpdateInterval setting is 0.04. print logs use callback block, about 1~15 mins later, CMMotionManager will stop working. This issue will be reproduced with high probability，you need to try multi times. Once a block occurs, it can never be recovered. Any suggestions? Thank you very much!