Disconnect after a few second

Hello!

I am using a nRF52840 board for some really simple development.
First I just tried to run the blinky example and connected with another BT device. It worked well but after a few seconds I just totally lost the connection and needed to connect again.
Do you know how can I solve it?

My main goal will be to create a simple GATT service with indicate, and notify flags and do some 1-2 hour term testing.
If somebody has any simple example code for this I would appreciate that.

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