Tried to reformat USB thumb drive and then it disappears


Got a USB thumb drive the other day for some file storage and it came formatted FAT32, so I wiped it with Disk Utility and now it won't show up on either a new finder window side bar or in Disk Utility. When I left it the usb slot for a few days it showed up again! Showed as FAT32 AGAIN and wiped it again and same result! It also got quite warm to the touch. Any suggestions?
I had one like that a couple weeks ago. It would eventually mount - sometimes takes a couple of hours to do that.
It was a 64GB stick for less than $10. I eventually gave up on using it.
If yours does that too --- return it, get your money back. (Get a name brand device this time :D )