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thanks.. problem solved. although it says previews on lock screen as well. but turning it on enables it for notification bar as well. earlier i felt its only lock screen and pop ups

"Thanks for sharing your concern. Kindly check mentioned steps to overcome the issue.
1.   Messages > Menu > Settings > Notifications.
In case the issue still remains, we welcome you to approach us via remote access feature under support option in Samsung Members App.
"

my key is sticky.also hardware not shown results only five check but nothing result.

i have since somé system alert is a minute with set alerts with vibrate.
i cannot found weres system's alerts
kindly help.mr to.out this problemd