My husband had not used the clock in about 4 days, then when he would use the clock as he noticed that the clock was not working. He tried to shake it so that it could move, he managed to get it going, but it worked only for five minutes then it worked no longer
So the clock is destroyed and we do not really know why. But we have had similar problems but it was enough that he shook it so it worked. I hope that when you replace it, so we will not have these problems.