Ultra Fit USB 3.0: Excessive Heat

Been trying to transfer whole images (5 GB plus) to my fit 128’s, and it throttles back the speed, then the drive winks out. I click continue after a cool down and it will continue.  After 4 times, Windows has had enough and thinks the drive is defective, and I start all over. It’s writing to the drive that makes it hot as it uses heat to write the bits to the chip. With USB 3.0 speed, I can see why. From now on, it’s drives with all metal chassis.