I'm on my second istick100w and yes i know the buttons rattle, but something else is going on. If you gently bang the mod on your palm and then give it a slight shake it sounds like something is loose in there. Something internally. i sent the first one back and asked for a replacement and same thing. I dont know if they just repackaged same one or if all the istick 100 w mods have the same problem. Of course i forgot to jot down the serial #. Is anyone else having same problems. Please let me know. I also tried contacting eleafworld, but thats still ongoing. Im not sure if i should replace the mod again. I know its only $30 bucks but still.