AC500+B300S suddenly discharges

Hi,
we are currently using an AC500 with one B300S module, and it’s behaving wrong. When the charge reaches 50% remaining, suddenly starts to discharge rapidly and suddenly turns everything off before reaching the 0% (load being always the same).
We’ve tried already recharging completely and discharging cycles, but still has the described behaviour.

What should we do to fix the issue?

thank you very much.

greetings!

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