Question: Random Vibration alerts cannot be tracked down
I've been using my iPhone 7 for nearly a year now, iOS11.2.6. During several months or more I've been getting random vibration alerts, with no notifications onscreen or sound. I went trough Notification center settings to make sure I either have app notifications fully disabled, or they have persistent banners assigned. However ghost alerts still persist.
This does not help me win anxiety and FoMO.
iPhone 7, iOS 11.2.6