Bought the GR7900KG-3 off of ebay. The battery was dead when I received the watch. I charged the watch and eventually came back on. It took almost 3 weeks but eventually the charge light quit flashing and the battery level is now on high. The problem I have now is the watch is in power saver mode, no buttons will work and has yet to auto set the time. Is there anything I can do to try and make the watch work properly?