Beacon suddenly stops getting detected for some time?

I am using AprilBeacon 305 sometimes the device get detected but sometimes its not.So we are ready with the system but facing the technical issue like this.
Please Help
Thank You.

Did you scan with iPhone or Android?

i tried with android.
now its not detecting at all.
What should i do?
please reply.
Thank You

Use other phone to have a try to see did the beacon can be detected
or cut off the power and then connect power to have a try