We have two Exchange 2013 servers, fully patched. Both are Server 2012 R2 virtual machines running off of different VM hosts. Both hosts are ESXi 5.5. They both back up to the same BDR.
Over the last week each server has crashed about once a day. Each time it is very sudden. Memory and CPU utilization is normal and then within a minute or two, the CPU is pegged and the server is unresponsive. We generally have to reset the VM in order to get access to the server. Since it is so sudden, we don't have time to see which process is maxing out the CPU.
We have several other servers in the same environment, including an Exchange 2010 server, which all work fine.
The event logs don't give a clear indication of what is causing the sudden spikes in CPU use. These are the only two Exchange 2013 servers we have running at this collocation, and they are the only two having this problem. It may just be a coincidence, but it's all we really have to go on at this point.
Appreciate any help you can give.