Thank you for the post @RufoArraga
I would recommend to have a look into this KB: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PMb2CAG to see you can get more information from the logs what the root cause is.
Additionally, I would restart management process: "debug software restart process management-server". I would also try to compare running configuration against last functional configuration to see whether any change has triggered it.
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