I have firmware version 1.7.64...update was early March it seems. But recently the watch seems not to want to hold charge. Yesterday it was charged via computer USB all day and overnight sat on then table doing nothing but only showed about twenty percent charge when I went for my run this morning. A similar update stuffed up my wife's Runner 3 a while back (1.7.53?). Has Tom Tom done it again with this update that was supposed to fix one issue one creating others?