I would suggest you first check if your BIOS/Firmware is updated. Also check if the components, especially memory, is on the Tested memory and hardware list.
As for C-states, those are the power saving states to reduce power consumption while the CPU is idle. Deeper C-States means lower power consumption, but longer entry/exit latency. C6 is the deep power down state that the CPU internal voltage is close to 0. You may try to disable it as a step of troubleshooting.
The memory rdimms are KVR13R9D4/8I and are on the tested list but the SSDs are not on that list. We will try first to disable C6 state from bios and hope it will solve our problem. We will schedule a downtime for this operation and come back with updates.