Run Task Manager to see if there is a lot of drive activity with regard to the USB drives. (A lot of continual drive activity could cause heat.) If there isn’t, then the USB port is likely putting out too much power. I don’t know how that could happen, unless there is a chip in the computer which is bad and which controls power output.
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If there is more than one USB port, does the problem happen when you plug the flash drives into a different USB port?
Run Task Manager to see if there is a lot of drive activity with regard to the USB drives. (A lot of continual drive activity could cause heat.) If there isn’t, then the USB port is likely putting out too much power. I don’t know how that could happen, unless there is a chip in the computer which is bad and which controls power output.