Got my rdna in the mail today. I almost went into meltdown mode when it wouldn't work at all unless I had the usb cord plugged in. Even then,it wouldn't fire. After an inspection of the battery compartment , I discovered that my negative battery terminal was fully compressed and not making contact. After a very careful pry job,its vaping like a dream with no other issues so far.
Yeah I have heard others having this problem as well.