The same problem happened to me today. In the morning my code was working, in the afternoon it didn't work for 3-4 hours. I spent all of my time and tried many things. But a little time before, it started working itself. I didn't change anything.
I suppose we can't trust apple servers about that..
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今天我也遇到了同样的问题。早上我的代码可以工作，下午3-4个小时就不能工作了。我花了我所有的时间，尝试了很多事情。但不久前，它开始自行发挥作用。我没有改变任何东西。
我想我们不能相信苹果的服务器。
The same problem happened to me today. In the morning my code was working, in the afternoon it didn't work for 3-4 hours. I spent all of my time and tried many things. But a little time before, it started working itself. I didn't change anything.
I suppose we can't trust apple servers about that..
这是一个很好的检查列表，可以解决这个问题：
Here it's a good check list that can solve this issues: