Hi,

 I use OpManager 12.4.079.  

Since Friday, I have been constantly received alarm: "Monitoring stopped. Only few devices are collecting data. Check "Devices/Monitors by DataCollection Failure" widgets under System Performance Dashboard to analyse the problem".

I restart the server or service, the program works two hours and again the same message arrives.

How can I resolve this issue? My infrastructure remains without monitoring and this is very critical to me.