Karbon tab: USB OTG problem

cray.x

Broken In
hello all i have recently bought a karbon tab that is karbonn smart tab 3 blade which runs on ICS, I'm having a very strange problem whenever i connect a pendrive or a HDD to it and press the sleep button the device disconnects on its own. i want to know is this normal? is it meant to be like that??? Its kind of annoying for me!
 
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