Does anyone have, the "lower reward" syndrome?

After every round i got much lesser reward than usual... I am beginning to panic!
These are usually around 0.0025, but now
18452 2013-06-07 10:39:27 0:14:40 2847270 229 0.00187782 240218 25.28180000 98 confirmations left
18451 2013-06-07 10:24:47 0:36:58 7112700 622 0.00193577 240216 25.46560009 96 confirmations left
18450 2013-06-07 09:47:49 1:31:11 17439636 1328 0.00158006 240210 25.31299996 90 confirmations left
It's not hard to work out.
whereas your own mining hash rate remains the same. So you will get less unless you increase your own personal hash rate in line with the overall bitcoin network hash rate.