Military production stopped

Hi, I’m having a bug when using the English civilization. It happends when I’m playing into a long game and all my military production is stopped and I don’t know the motive. I still have capacity of citizens and I didn’t lose any important building. I’d like to know if someone could help me to resolve this problem.

Did you save your game and load it ?

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the same thing has happened to me as well but i did save and come back to it later and all my unit production stopped except for my temples