Potentially that could be the case, all the boards have been charged using the same 2A wall wart at some point or other. The first blew initially in normal use waking from off. It then fried the board when used whilst charging. The second again in normal use waking from off. Fuse replaced started sparking across the 510. The efusion blew waking from off, not changing that fuse its off for RMA as we speak. From two working DNA 200s to none in a few days Awesome! Back to the old faithful Sigelei 100w no fuses, no stress, just no TC or USB charging.