Instruct: Classify Amazon reviews into positive or negative sentiment
Query: overheating,kills usb devices

I own 4 of these hubs,2 older and 2 more recent. 2 have died. They get very hot,especially when stacked ( I quit stacking them). Unreliable power out,despite huge powersupply bricks. Frequent connection issues. One of the newer ones just killed 2 flash drives and smells bad. I am chucking them all and starting over...Pros:great form design! Newer ones (3-4 mo) leds only light on active ports not all.Cons:Unreliable/overheating,has killed other devices,if you stack more than 2 blocks access to top ports