问题原因：
1. 手机信号不良。
2. 对方信号不良或误操作。
3. 手机系统空间不足。
方法一：
检查手机信号是否稳定。若信号不稳定或信号较弱，正在进行的通话被自动切断是完全可能的，建议移动到室外或开阔地带等信号良好的地方重拨尝试。
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方法二：
挂断操作是通话双方都可以进行的操作，如果不是自己这边信号不好的话，不妨确认一下是否是对方信号不好或是误操作。（如果再次通话询问又自动挂断的话还可以选择短信及其他通讯手段询问）。
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方法三：
1. 当手机内部系统反应过慢或缓存过多时，也有可能造成通话被迫中止的情况。这种情况是手机过久没有清理垃圾文件，系统空间严重不足造成的，这里建议先用并不是很占空间的360清理大师解决系统空间的燃眉之急。首先打开360浏览器。
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2. 在浏览器搜索框中输入“360清理大师”，点击搜索。
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3在出现的结果中，出于对手机安全考虑建议进入官网下载。
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4. 点击下载即可，这个过程需要等待数秒。
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5. 下载完成后，会自动弹出安装界面，点击安装。
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6. 安装完成后，建议立即立即打开进行清理。点击安装完成界面上的打开按钮，进入开始清理垃圾。
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7. 进入后，它会自动进行垃圾文件扫描，你要做的只是等待扫描完成后的“清理垃圾”并点击。
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8. 清理完垃圾文件后，会为手机系统功能腾出更多空间，就不用担心因为空间不足而挂断通话了。（另外，能定期对手机进行清理更好）
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