iPhone 6s randomly vibrates
The last two days (October 19 & 20, 2020), my iPhone 6s occasionally starts for no discernable reason vibrating, as if I just received a text or am getting a calendar alarm. However, there or no texts, calls, or alarms set for that time. Sometimes it’ll vibrate once, then again; but sometimes the vibration “notifications of nothing” will keep going every so often for minutes. I’ve powered down and then up, and sometimes that doesn’t work, sometimes it does. Any help appreciated!
iPhone 6s