Hi jan, well I'm glad that it is better now!

That is pretty mysterious though.

Did you possibly have some hot weather the past few days? Maybe your machine was getting overheated.

You might take look to see if it is clogged up with a lot of dust, or if any fans inside of it have stopped working, or if it is pushed too close up against a wall where there may not be enough space to have good airflow coming out of the case... Just a possible thought.

- Michael