Hi Navjot! I would love to help you with your issue.
I have a couple reasons why it may not be working right.
Reason 1: Your phone has a issue with the Bluetooth transmitter/receiver, and you can get it fixed.
Reason 2: Something to do with you software, like a recent update, or needing to install correct drivers.
You can find the drivers by searching online or going to the Samsung website.
I hope this helps.
Have a great day!
Gilchrist Dean.