IBM DPS 2980AB random shutdown

[peoples]

Hey guys,

got some headache here with IBM PDUs .

Have a bunch of IBM DPS-2980 AB-A Blade PDUs (2980W) and randomly the PDUs shutdown themselves. DC OK green light goes off .
Just turning off and on again it starts up and runs again... Shutdowns are from 10 mins to few days.
There is no overload and input voltage is stable arround 233V on the grid.

Does some experience the same with this PDUs ? For me it looks like a kind of safety feature from the PDU itself ?

Thanks
regards