My RAM is fine, it's DCS' desire for evermore memory. I have 16GB Corsair RAM and had a 16GB pagefile on my C drive which was an NVME (M2) drive with Windows.
Apparent solution
I've set the pagefile on my C drive to 'System Managed' and put a page file on my 2TB SSD that's 2.5x time my RAM (so 40GB). That's seems to have solved the issue. Played for about 40 mins with no crashes.
I read elsewhere on the internet that at minimum a pagefile should be 1.5x your RAM, for best stability 4x your RAM.
al531246's post in key command[] for device[] has different name from command was marked as the answer