We were having the same problem a few weeks ago after we built the new system. Normally we would have liked to run with a minimum of 8GB RAM, however we had to reduce the machines to 2GB. It seems it’s the only way it will work right now and get a solid throughput without crashing.
Apple, AJA, and our friends at Virtual Media are aware of the problem and are trying to find a solution.
I have a combined 12GB of RAM waiting in boxes ready to go to work in our two machines!