bonding lost in Android after Error Code: Attribute Not Found (0x0a)

Hi,

I have an NRF52840 as the peripheral and an Android phone as the central. Most of the time the connection can be established without any problems but sometimes during the connection, the information about the bonding gets lost from the pairing list of the phone.

After many trials I succeeded to reproduce the issue with the sniffer it seems that the phone is sending many Attribute Not Found (0x0a) errors and they lead to initiating the pairing from the beginning.

Can you please tell me what this error means? and how it can cause bonding deletion.

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