This is highly unlikely. I'm on a team that administers an EC2 infrastructure with tens of terabytes of RAM, and I've never seen anything that resembles memory

This is highly unlikely. I'm on a team that administers an EC2 infrastructure with tens of terabytes of RAM, and I've never seen anything that resembles memory errors. Considering the findings of http://www.cs.toronto.edu/~bianca/papers/sigmetrics09.pdf http://www.cs.toronto.edu/~bianca/papers/sigmetrics09.pdf, this would be rather extraordinary.