Hi
yves31,
Do you use any USB function like aicloud, FTP, media server , download master, when inserting USB drive?
Did the issue happen before the firmware update(3.0.0.4.384_81992)?
Could you provide us the Settings and the SYSLOG file after the issue happens again?
Settings(config log with user account and password):WebUI>advanced settings>Administration>Restore/Save/Upload Setting>Save setting
SYSLOG : WebUI>advanced settings>System log>save
Please save log file after inserting USB drive, WebUI became inaccessible and router rebooting.
Thank you.