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I just had a 32GB Thumb drive fail during creation of the bootable Win10 setup, even Linux with GPARTED couldn't read it correctly. Good thing for sales, only cost $6.99.
Version 7.2 of Macrium Reflect introduced a similar bug (any USB device was in use all of the the time). But it was fixed relatively fast. Have you updated MR to Ver 7.2.3825 at least ?