What's the difference between 不停 and 不斷？
You can understand it by each character in the words. 停 means stop while 断 means no more. Thus, 不停 means keep on going while 不断 means it is not the end. You can also compare with 不息 and 不止，there is a saying that 生命不息，奋斗不止 which means I will struggle till the end of my life. 止 has the same meaning as 停 sometimes, for example, 停止. 息 also has the same meaning as 停 here.