I'd just be worried about running into issues or crashes later with other things as well. Some games hit your hardware just right in just the right way to make an error to cause a crash. My home pc spent two years running games without ever crashing. Then I ran into a game that would crash maybe once or twice an hour. I after a lot (a flipping lot) of testing I determined it was a ram issue and I had to loosen my timing up a bit on it.

It seemed like it would be a ram issue pretty early on in my diagnosis and by its behavior, but getting my confirmation took forever. I had to run the extended 8+ hour worth of meanest before it would finally hit my ram in just the right way to log an error.

It sounds like you may have more or less the same issue, though. Only your system isn't running right when it's on default values. You may have a ram chip in there (i think theres like 8) that is just slightly flawed or isn't quite getting power to it correctly and something about Sony just happens to tweak on it in just the wrong way.

For real, just have valve get you another. No reason to put up with a system that isn't quite right, and it could get worse.