Main Server Crashed

Today we had a crash of our main machine. It took us 1 hour to restart everything as it was late and no one was in the office. This was the reason BibSonomy was not available. Unfortunately this is the third time within 4 weeks that the machine crashed. We are now searching for the reason but currently we have no clue as we did not observe any special situation. It seem to be some strange hardware defect. Lets cross the finger that we can figure out the problem soon.