Who mentioned earnings
This was a question about pool hash rate.

my earnings are 1/3 what they were just 2 week ago because of increasing pool hash rate and difficulty increase. when I started here pool was 8 now were looking at 250...

Your earnings aren't directly affected by the pool hash rate; they're only affected by the difficulty. Of course, difficulty increases because of the overall hash rate increase, but during any difficulty round, increases in the pool (or total network) hash rate has no affect at all on your earnings.

If you're only getting 1/3 from two weeks ago, you're probably just having bad luck at the moment. Difficulty then was a bit more that half of what it is now, so your earning should be about 1/2 (actually a little bit more).

Indeed, but in the case of two users, you would win blocks twice as quickly since the pool's hash is doubled so the overall earnings would be the same.

Since bitcoin was invented. Your earnings (whether you're mining solo or in a pool) depend only on your hash rate compared to the current difficulty. If during a difficulty round your pool's hash rate increases, then blocks will be found more quickly but you get a smaller share of each one so your average earnings will stay the same until the next difficulty change.

the figures up on the right should answer your question

http://bitcoincharts.com/markets/

Not sure what happen? Miners were not down.

 
#               Block found at Duration                    Total shares                 Your shares            Your BTC reward          Block #             Block value              Validity
20474         2013-10-19 19:49:11 0:58:18         183619562                   14319                   0.00278337                 264716           25.05891520      98 confirmations left  
20473         2013-10-19 18:50:53 4:18:43         806905065                  47775                    0.00000000                 264706           25.02120000      88 confirmations left  
20472         2013-10-19 14:32:10 0:33:05         101910920                   9975                     0.00273336                 264672           25.12480605      54 confirmations left  
20471         2013-10-19 13:59:05 1:34:50        290381577                   31050                    0.00262393                 264664           25.03999643      46 confirmations left  
20470         2013-10-19 12:24:15 0:36:09        109556297                   12050                    0.00281957                 264650           25.06568921      32 confirmations left  

Comparing your fraction of shares to Total shares to mine, there is clearly a lower value for this block, perhaps your rig or internet connection had some issue towards the end of the block
Block #   Share ratio Aurel57/Kabopar
20474   1.649844452
20473   1.225817211
20472   1.936893204
20471   2.221506761
20470   2.186536019

for the one minute it takes to shut it down and plug it in and turn it back on I don't think you will miss much BTC . better safe than sorry?

Yes It was a internet connection issue. Have loss it a couple more times since.