I've lost heaps of blocks too. This was from machines that I know weren't on randoms because I had buffered nearly a weeks supply. 500 blocks gave 200 on dnet. One flush of about 400-500 just dissapeared? This was on a new machine that I hadn't flushed before, but had new packets from Mika's on it.
OOM🙁
Well waddya know! The missing blocks all came back and reappeared on dnet? 🙂 Hang in there, there might be nice surprises for others as well.