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BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION issue in the BLE_HRS_C when i try to connect the heart rate band with nRF52832dk

I am trying to connect and read the data of the MIO Fuse heart rate band. It is designed as per the Bluetooth SIG specifications i.e heart rate service UUID is 180D and the heart rate characteristic UUID is 2A37. I am using the nrf_sdk_v15.0 BLE_HRS_C in which i manually mention the peripheral name to scan. It gets connected and then disconnected due to the reason 0x13 i.e when i tried debugging in the ble_hci.h file the reason was  "BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION". I don't know why it gets terminated automatically. There is no issue with the board or heart rate band since it is working fine with the nrf connect desktop application and i am able to read the data. So what can be the reason behind the termination. I have attached my screenshot of the RTT log with the issue highlighted. I don't know how to proceed further. It is also throwing a fatal error so once i resolve the first issue i can try for next.

Kindly help with this issue. 

Thanks and Regards,

Santosh Krishnan R 

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