We have one of our guys looking into that; he actually just came over to chat about it while I was typing up this response. He has an idea for why it's happening, but is still working on the best solution for solving the problem.
I'm not sure if the inventory freeze is related (I've noticed it happens less now than it did in the past), but yeah, still an issue we want to solve.
We also still want to improve the sorting to help with this too, just not sure where that fits into our short term plans.