[AC Question]

I lately started missing calls and notifications. Looking at my settings the phone was set to vibrate. First I thought this was by accident, and I turned it back to sound. But this keeps happening. the other day I looked at my phone and it turned to vibrate, with me just holding the phone not touching the screen or any buttons ! This has only been happening for a few days. I have tried wiping the cache, but that did not help. I am on Android 5.1.1, and I do not want to upgrade as I need WiFi on and not go to sleep, which does not work on Android 6...

[B. Diddy]

Welcome to Android Central! Which phone? It's possible the Volume Down button is faulty, and might be intermittently getting stuck in a pressed state. This would bring the volume down to Vibrate.