2 network management systems?

Our current network management system is a bit stuffed. Our network ahs grown quite large and our NMS is experiencing hiccups. Stuff like mistakenly sending alarms for something that was down for 1 second but was never actually down(we have checked).

We have tried beefing up the VM, giving it more vCPUs, RAM, multiple 1G links etc... But it still experiences problems.

Would making a separate 2nd NMS alleviate those issues? I.e. one NMS only watches one half of the network? Like only customers routers? We would also need to place the second NMS at a different place in the network to manage congestion.

Ofcourse then if we have an interlinked downtime we would need to look at 2 places but, eh, you win some you lose some.