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1.If the Bluetooth disconnection time is too long or the signal is interfered with, it may cause the automatic reconnection to fail. At this time, you can reconnect manually. Refer to 4. How to Synchronize Data
蓝牙断开时间太久或信号被干扰，有可能导致自动重连失效，此时可以手动重连，请参考 4.如何同步数据2. Android phones: Some Android phones do not allow APPs to live in the background by default. After the APP runs in the background for a while, it will be killed by the system, causing Bluetooth to disconnect. Please trust the APP in the permission settings and allow the APP to run in the background.
安卓手机：部分安卓手机默认是不充许APP常驻后台，APP在后台运行一段时间后就会被系统杀死，会导致蓝牙断开。请在权限设置中信任APP并充许APP在后台运行。3.Android Phone: Already allowed to run in the background, why the phone and the bracelet are close or Bluetooth
安卓手机：已经充许手机在后台运行，为什么手机和手环很近还是会断开蓝牙If too much software is running in the background, it will result in insufficient memory and the system will kill the infrequent APP. Please clear frequently used background memory to prevent the memory shortage of APP from being killed.
如果后台运行了太多软件，会导致内存不足，系统会杀死不常活动的APP；请经常清除系统不常用的后台内存，防止内在不足APP被杀死Google Sites
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