Suddenly my device stops working

My device is registered in an application that until a few days ago was working but all of a sudden it tries to do joinOTAA and it doesn’t manage to do the join.I can see how it receives the accept join request but the next message is Forward join-accept message.
How can I solve this problem?

Need details and full disclosure before any of the Forum mind readers &/or crystal ball gazers can step in to help debug…have you changed anything in that time? Has device restarted at some point? (Changed battery etc.). Look to what normally gets asked as part of the usual 20 questions/Spanish Inquisition sessions debugging on the Forum to see what we expect to see wrt details, then when you have compiled the set of info come back and post again.

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