i never had that issue, i just close the USB app when im done, and if i need, reconnect it again to do something i forgot...
ahh, when you want to disconnect, please go in the notification of USB and put to unmount, not just remove the cable. is what i do.
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Don't get me wrong, but I'm really offensive when I get offended with something.
Former SMARTPhones: Nokia E61, Moto Q, HTC P4351, Nokia N85, Moto Dext/Cliq(Morrison/MB200), Moto Atrix (Olympus/MB860), Sony Xperia S(Nozomi/LT26i), Samsung Galaxy S Advance(SII Lite/ i9070).