Confira o arquivo /etc/usb_modeswitch.conf
.
No final, você encontrará:
# Optional increase of "delay_use" for the usb-storage driver; there are hints
# that a recent kernel default change to 1 sec. may lead to problems, particu-
# larly with USB 3.0 ports. Set this to at least 3 (seconds) in that case.
# Does nothing if the current system value is same or higher
SetStorageDelay=3
Tente 3 ou 5 segundos aqui.