Factory-USB destroyed within a first long print

I Got my Snapmaker 350 last week and started the first print with the 350(enclusured). but after now a little more than a day, the printer stucks after getting ready nearly 60%of a print. After a little investigation i can’t see the usb device anymore in the menu and tried to disconnect it.
It was so hot i burnd my fingertips and the usb itself is defekt now.

The snapmaker is still functional, even the usb works with the older usb from the snapmaker one.

I wonder if you have ever tested bigger prints, with a working time over days within the enclosure. Have you ever noticed a very hot usb device or is it just a defekt single one.

Kinds Wolf