Sometimes miss didExit events of iBeacon in iOS

[jackson140389]

Hello Guys, I'm using beacon(Moko Beacon) to track the location of the vehicle. Sometimes didExit event didn't call even beacon distance more than 3 km. After I come back to beacon didEnter event didn't call until change the power cycle of the beacon. So please help me out I have already spent more than 5 days to overcome this issue. But still, I didn't get the solution yet.