SQL Monitor 22.214.171.1243 Causing CPU Spikes
After a looking at a few things we realised the PC where we run SQL Monitor on had been rebooted a few times. These reboots seems to correspond with the CPU spikes.
So we tested it by rebooting SQL Monitor again and sure enough it case the CPU spikes on all monitored servers.
These spikes don't last very long but they do reach close to 100% (maxing out on some occasions)