I tried searching to see if this is a common problem or not. I got the watch as new but opened and the box had cosmetic damage. It looked sort of used but not exactly worn. I was setting up the watch and it is weird as it is like a newer version of the WVA-430 nd WVA-470 the obvious difference is those were wave ceptor and the WVA-M640 is Multi-Band 6 and it only has 3 buttons, there is no top left button. When I was setting up the watch the B button (on this watch the b-button is the lower left button) worked to cycle through modes. Then while in mode changing you need to hold down that b button for 2 seconds to bring it back to timekeeping mode. That was the last time the B button worked but now I am stuck in timekeeping mode. Holding it down for 2 seconds does nothing as well as just pressing it with shorter intervals. The top right "A" button turns the light on, or holding it for 2 seconds will adjust for 12hr or 24hr mode. The bottom right "C" button will cycle through A)current time, B) day and date (SA 25) and C) seconds. Anyone have any suggestions here? It's a nice watch but without the "B" button working it is useless.