Beacon detecting issue Samsung Galaxy S9 Plus

We are facing some issue in detecting the beacon with Samsung Galaxy S9 Plus (Android 8.0.0).
Estimote SDK version 1.0.3.
We are getting a beacon observer error. ‘Cannot start proximity observer with error code 2’.
This happens after multiple beacon detections. After rebooting the phone, it works for some time, again after that it stops detecting the beacon and gives same error.

Could you please help with this.