CPU928 OVERALL RESET

Hello 

i have a problem with a s5 system with four cpus and a coocrdinator.Almost every two days all cpus go to stop and the first cpu needs overall reset.I checked the back up programm from all cpus with the online and i dont see differences.I changed the main psu, all cpus coordinator and the rack but still the problem occurs.Because this problem occurs at night shift( i work in the morning) i couldnt check the i stack every time.The only time i could check i got these screens and i couldnt find out what the problem is.I would appreciate any help

thank you in advance