i actually just had the same thing happened to me i tried opening it and notice the button for the R attaching at the board came loose. but before i did that all buttons suddenly became haywire. i dont why that happened maybe it might be because i sprayed wd-40 (for electronics and board) without detaching the battery first. ill be needing to check this more but i definitely have to do some soldering the button. im just not sure yet if the button connecting the the board is still be able to be used.