I am having an issue where on a couple of newer Samsung TV's that won't recognize the USB media (the one with the Penguin Icon)  whenever I take it out and reinsert it. 
My FW is 1.11.  Disconnecting the Samsung TV network and reconnecting the network seem to solve this issue.  Is there a better solution?
I dont have an issue connecting the USB via Windows.
I am using the USB to share media so the kids can watch school lessons in 4K on the big TV without the lags and using up data.