This is starting to sound like either Kafka, or Men in Black. Or both.
Windows is a pain about this kind of thing. Do you have some other drives hanging around? It seems odd for it to jump from G to M without the other stuff being taken up. Anyway, I'm not sure if this will stick, but you might try setting the drive letter manually. Right-click "My Computer", choose "Manage", and open "Disk Management" under "Storage". You can right-click volumes to reassign letters.
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