Finally, I got a workaround. This thread was quite helpful. https://developer.apple.com/forums/thread/123624 I just set these observer in awake function, NotificationCenter.default.addObserver( self, selector: #selector(self.applicationDidBecomeActive), name: WKExtension.applicationDidBecomeActiveNotification, object: nil ) thus, wrote callback for restore previous state like this. func applicationDidBecomeActive() { if (PlayingRecord.currentHole == self.holeNum) { self.becomeCurrentPage() self.updateView() } } I hope this would be someone's help.

Unfortunately, my user told me that the problem was still alive.... Do you have any solution? I'll try a binary search debugging.

My app user who met the issue told me a workaround of this problem. If she turn off wrist detection feature on, the problem will be resolved. I'd like to resolve this problem by writing program. Do you have any clue of this problem?

My app user who met the issue told me a workaround of this problem. If she turn off wrist detection feature on, the problem will be resolved. I'd like to resolve this problem by writing program. Do you have any clue of this problem?

My user who met this issue told me a workaround of this problem. If she turn on wrist detection in the passcode menu of WatchOS, the problem disappear. However, it's of course a workaround. Do you have any clues to resolve the issue by writing program?