Connection lost after some seconds

Hi, I was able to link my end-device to the server and I can see the data that it is sending, but some seconds after that, I lose the link and I need to make it join again, is there a way of setting a stable join between the end-devices and loraserver? Am I missing some parameters when I make them join?
Thanks in advance!

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Can you put logs to help us to udnerstand ?