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CC4305137通电一段时间电流突然下降

做CC4305137这个片子做了了也发射器和一个接收器,接收器始终处于活跃状态电源总电流18mA,一开始通电,发射机发射数据,接收机可以正常接收,过半个小时到一个小时,接收机的总电流突然下降到2~3mA  并且发射机发射的数据 ,接收机接收不到,请问这个是什么原因?    苦恼了好多天了