We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
these are called CTDs (crash to desktop). Experiencing a few here and there after long hours of play is normal, but it shouldn't be very frequent. How often do you get them? Do you get them at a specific date?
Check the running problems thread, it contains a few good suggestions. Defragging the hard drive always help, making sure there are nothing in the background will also help you.