800xa v5.1 A/E strange behavior

Hi,
I'm facing with some problems.We have redundant system in 800xa v5.1 (two Aspect server, two Domain server, two connectivity and one Engineering)
My first question is: some objects for example "motor vibration object" when an alarm activates, It shows alarm activation icon on its faceplate but alarm automatically acknowledged by system and also it doesn't appear in object's alarm list and event list. How can i fix this problem?
My second question is: Systems (all nodes) real time backwarded automatically.I checked everything, all things work fine!

Best Regard.