The notification of Opmanager wrong!

The notification of Opmanager wrong!

I was try Opmanager V6. and 7.
The alarm of Opmanager alway notification for any device whith message:
"Device not responding: Probably down or busy " and then "Device Active and Responding " whith frequency equivalent of time.
(image attach)
while the device and network active nomarly.
I don't know why! please help.

Thanks






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