Peak in 'Failed to Encrypt' Error

Hi!
We have tags based on nrf52840 and nrf52833 in the field, running against a central with a nrf840X dongle.

Recently we have had an inexplicable peak in 'Failed to Encrypt' Errors, without a good reason.

The overall connectivity (ie - tags that connected before) has not been harmed - however it takes longer than usual for the tags to connect.

Is there a known reason for something like this?

Thanks!

Roi

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