I noticed usually at night (though I'm uncertain at time), my Note4 (which I bought as
a used device) will go into 'silent mode' ie when new Whatsapp/SMS comes, it is quiet
despite that on some crucial Whatsapp group, I set 'Custom notifications" to alert
with sounds (as I am on-call 24x7).
I will notice that following will become disabled (ie at the lowest/minimum setting)
& after enabling it back, it will go back again & again (with each day) without
intervention from me.
Settings => Sounds & Notifications => Notifications
When new Whatsapp comes, the pop-up still appear tho
(this is a setting under Custom Notifications)
When I first got the device from the seller, there's a pop-up saying "Good Night,
do you want to silent your phone" which I will cancel but I don't see this pop-up
anymore the last 2 weeks.
What can I do to disable this 'auto-silent' mode which doesn't reverse itself
even day breaks (it's morning)?