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Android GATT 133 error

Hi. I'm using nRF52832, SDK13.0.0, S132.

First of all, I already know this Q has lots of Q and A.

But I'm so confused which case do I pick.

In my case, iPhone has no problem with connection and disconnection.

But only Android has problems.

1. Connection : Andoird phone hardly connect my device. It returns GATT error 133.

After application try more(3~4 times more), it connects.

2. Disconnection : After making connection, if Android apllication start 'disconnect', it takes 30 senconds around to get 'disconnected'

If my device start 'disconnect', connection is disconnected immediately.

Could you give me an advice?

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