we dont have a dedicab, but we have a POS that used to have that problem with the lagging and the USB problem, but ive experienced the NoName thing when i leave the flash drive in after it saves and play another game right after that. only thing i can suggest is if you're gonna play multiple chains of games, remove the card and input it again after the icon disappears or resart the machine.
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Friends don't let friends play DDR with charlie horses.