@Tim HunterEvent ID 1000 refers to an application crash. By clicking on the event and looking at the details, you can see which application it was. If it is always the same application, then it indicates that something is wrong with the application in question. If all your events are the same as the one in your screenshot, this is a failure in dwm which is the Desktop Window Manager. Yes, this is bad; you will see your desktop suddenly failing each time dwm fails. This will be at the very least annoying for the user, even if it is reloaded automatically.