r u on p2pool?
I am solo-mining with my army of GPUs. I am not in any pools at the moment... I avoid pools, due to the many "issues" that more-often-than-not, lead to losses. (Some losses are acceptable, but when they constantly "cut your connection", to make you "loose shares", and "estimate poorly", and "drop actual earned shares"... yet they mine themselves too... thus gain both ways. I loose faith. Sadly, it is the smaller pools that get the short end of the stick, trying to help-out those who just can't solo-mine anything.)
All pools as of late, have had the same results. (Not bitcoin pools, because those blocks are so far away, and obviously, low diffs don't even matter to bitcoins. However, shares have seen similar results, if you set shares to 4K-20K... but no-one uses shares that high.)
Easy to see it visually than to try to explain.
http://www.coinwarz.com/cryptocurrencyYou can see the results in the graphs here, related to diff issues... diffs should be going up, not down... they do go up, when people stop mining. They stop, because the diff drops, and less coins are produced, due to the above stated issue of "more rejects of valids"... Rejecting 140K submits with diff of 30K, withe no other block in range. Thus, not rejected sue to being "close" or "too late to submit"... Just flat out rejected.
I even have one with a big fat "?" in my list of transactions... lol... even the wallet is not sure what to think of it! (Eg, not rejected, not an orphan, just a "?" not sure what it is. Valid when found, valid when submitted, but "?" in my wallet, and the network, I assume.)