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All, please see https://forum.duet3d.com/topic/36689/random-hard-fault-resets-on-duet-3-mini-wifi and provide any additional reports there. I am locking this thread.
All I can add is that there is a bug fix release for 2.05.1 that you should probably update to.
https://github.com/Duet3D/RepRapFirmware/releases/tag/2.05.1
Signal strength of -73dBm is marginal for the WiFi module. Please see https://duet3d.dozuki.com/Wiki/WiFi_disconnections_and_AJAX_timeout_errors.