T2550 Failure

We have a T2550 that fails.
It ran a process when it suddenly crashed.
I have red light in X on the controller and all the analog modules are red. The digital modules are not led.
After a reboot, it started as normal, and everything worked again, but after 20 minutes. It crashed again. I have now tried 5 times with the same result.
Do you have any idea on what cut be the problem?

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