I never move this beacone, but didEnterRegion continuously occurred

One beacon is near iphone 5. I developed sample app, based on your Example demo. I never move this beacone.
My sample is just notified local notification in background.
but didEnterRegion and didExitRegion event occurred continuously. Why ? Anyone know this?

didExitRegion -> didEnterRegion -> a few minutes -> didExitRegion -> didEnterRegion > a few minutes ->
again
again
again

I use latest version.

Anyone know about it

Question

Hey there -- can you try playing with advertising interval and broadcasting power settings of your beacon? Lowering the adv. interval and increasing the power might help improve signal stability. Just keep in mind that this usually comes at the expense of increased power consumption and thus lower battery life, so try aiming for some middleground.