Disconnected, what can I do?

I have an android phone and a pc in a local network, the devices are known to each other and already synced a lot of files. Sometimes it works like a charm, but sometimes the devices don’t want to connect to each other. And I do not see any reason why not. How can i find out what the problem is?

Currently, they are in the same local network, syncthing is running on both devices, but they just show “disconnected” and I have no idead why is that.

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yes what i exactly want to know i hope is there anyone here who can help me out too. with regards jason smith