HI I am building a beacon deployment app which detects NFC beacons when tapped on to back of the phone and then proceed with deployment process. The problem i am facing now is that, when i tap a beacon it will not be detected sometimes and failure sound will come from the estimote app. What is the root cause of this? When i sync the beacon again with the estimote app, it gets detected again via nfc. So when this beacon goes to state where in it can not be detected by NFC?