Sometimes out of nowhere notification sound comes but there is no notification and also one more issue found regarding clock app. You know how clock app gives a notification 2hrs before the destined alarm time. Suppose if you set the alarm at 8:30 then at 6:30 clock gives notification and it can be seen in the notification bar. Usually there won't be any sound for this but in the new update notification sound is heard whenever 2hrs to go notification pops up and it's irritating and disturbing. Is anyone else facing the issue?