Net hashrate has been decreased and 100k lastNshares value became too high.
I set it to 5k now and later today i'll try to switch pool to proportional reward system. It should not be affected by net and pool load changes.
I don't know what's going on, but the past couple days I haven't earned anywhere near what I'm supposed to be earning. Have you implemented the proportional reward system yet? Your pool looks like it's going to die if you don't fix it, there's barely anyone mining there anymore.