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I think, I have found the problem.

I was making the ros launch and all the other process through ssh, in order to control it remotely.

Therefore, it was needed to use a local network. If the connection is broken, the ssh will wait unit the connection is reestablished. Because if that it stops the process and put in a queue all the commands, which were not received by the ssh connection.

The answer is to implement an ethernet connection, or run the nodes directly on the raspberry.

With this method is was able to run 2 days long.