I got this xperia xz1 compact a month ago, and yesterday I put the phone on the desk, a long and sharp beeping sound went off. It kept on going until i switch it the phone off. The screen did not light up, there was no message that showed up, and it did no vibrate when the sound went off. There was no alarm nor timer set at that time, and I was sure it was not an emergency alert. And around the same time today, it happen again.
Anybody know what would cause this?
