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终端节点改变父亲节点后收不到发给它的数据

大家好 有个问题请教一下:
使用zstack home1.2.2a 现在有A(协调器)B(路由)C(路由)D(终端节点)4个节点。D与A之间绑定,D的父亲节点是B,每次D给A发送消息后,A会给D回复相应消息。问题是当D的父亲节点变为C以后,D可以把消息发送到A节点,但是D收不到A的消息了,这是为什么呢?