Why does my iPhone only vibrate once when I get a notification?

Why does my iPhone only vibrate once when I get a notification?
I’ve been experiencing an issue where my iPhone only vibrates once when I get a notification, regardless of the app or the type of alert. It’s quite frustrating because I often miss important messages and calls as the single vibration is not enough to catch my attention, especially if I’m in another room or if my phone is in my pocket. I haven’t made any recent changes to my settings or installed any new apps that might cause this. I’m looking for some insights into why this might be happening and what could be causing this behavior on my iPhone.
9 Answers

A software bug may cause your iPhone to vibrate only once. Restarting the device often resolves this. Hold down the side button and a volume button until you see the power off slider. Slide to power off, then hold the side button again to restart. It’s also a good idea to update your iOS to the latest version as updates can fix bugs.