Default Help me plzz...USB OTG Removed Unexpextedly...

i am using a OTG cable to connect my pendrives to my Sony Xperia C...everything works fine....but when i try to remove my pendrive after tapping on the option to safely remove the usb drive, i always get an error saying "usb otg unexpectedly removed". i have tried this will all of my sandisk pendrives, i face this same problem. How to get rid of this problem ??? plz help...