V2 hub (STH-ETH-200) is offline and overheating

My STH Hub v2 model (STH-ETH-200) went offline while ago. When I opened the lid to replace the batteries as potential reason for being dead, I found some signs of the previous battery leaking. I continued the reset process as suggested by SmartThing and replaced the alkaline batteries per recommendation after the factory reset is done. However the batteries and device started to heat up that after 5 min I could not even touch it and it was close to damage the device. By the way, the device seems completely dead even before starting the process as I could not see any lights on. The same situation existed after battery replacement. If I were not with the device, the heat up could be a serious fire hazard. Any idea why device became dead and so dangerous suddenly? a