This "x4" thing is a label of some action which init is trying to start but it is not working. Every time it breaks, init restarts it again and, as it is happening too fast, it disables for 5 minutes. After this time, the process starts again. First you need to know what process is this. You can edit or view "/etc/inittab", looking for a line starting with this label. I would guess it is Xwindow.