Mining speed

[stderr]

Must send it here 'couse of restrictions..

Hi all,

maybe stupid question, maybe there are a lot of similar ones, but I can't find anything relevant. I'm very new with bitcoin and havn't any ambition to be a big gold miner, but there must be a problem with...something.
I started to use official bitcoin program tomorrow and there were some count of computed blocks per time (80.000 per half an hour I guess) but after some time (three hours) it stops and now there is one block per cca three minutes. What happens? I'm using it on linux box.

Thanks.

Edit:
In debug.log are any errors:
ERROR: ConnectInputs() : 2f2e869603 mapTransactions prev not found 1f53d188c1                                                                         
ERROR: AcceptToMemoryPool() : ConnectInputs failed 2f2e869603

[localhost]

Hi,

Just to be sure: what program are you running exactly? The one there: http://www.bitcoin.org ? If yes, that's not a miner, that's "just" the program to handle your wallet.

[Revalin]

To mine you need mining software, not wallet software.  Use this: http://bitcointalk.org/?topic=3878.0

You'll also need an account with a mining pool (solo mining is basically impossible unless you have a very expensive rig).  Here are some pools:  https://en.bitcoin.it/wiki/Comparison_of_mining_pools