Unknown notification sound on macbook (13", retina early 2015)
Hello,
for reasons I don't understand, my Macbook started to make a notification sound I have never heard before. It's not regular but it can be 3 times an hour. I have turned off all the notifications sounds and it plays even when the computer is in «not disturb» mode.
I have read other questions similar to mine but could not find the answer. Battery was changed a bit before that started to happen.
Thanks for your ideas...
MacBook