[Al Skierkiewicz]

This has question has been asked as long as we have been using this interface. The power supply is not that critical but all teams must remember that it just supplies power to on board power supply circuits. If you interface is getting hot there is something wrong with it not the external supply.
As a test, try powering the OI through the tether. Does it get hot and shut down that way as well? If it does you have a defective OI and it needs to be returned for repair.