OK so that is what happens to block 18290. It looks like you were mining only first 3 minutes of that block. So this is normal. But I don't get it why you got double from block 18291 since you didn't increase hashes... Did you change anything? The only thing I can think of that could be is a difficulty error in a score system and you change it from 2 to 1. But I guess someone would report that already... Looks really strange...
I haven't changed anything. so it's kind of confusing. Also, I'm on difficulty 6
Losing most of my reward for a short disconnect seems to be very unfair in my opinion. I would really appreciate if slush would explain what happened.