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Possible reasons for disconnect reason 0x8

Central info
   SDK: 15.3
   nRF52840

Peripheral info
   SDK: 13.1
   nRF52832

Number of connected devices
Central 1: Peripheral 15


Connect these devices and leave them alone.
If communication is performed regularly, BLE communication may be unexpectedly disconnected.
(Communication with one of the pheripherals is disconnected.)

Disconnect reason is 0x8 (BLE_HCI_CONNECTION_TIMEOUT).
Why does this disconnect reason occur?

Is it possible to get a list of possible causes?

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