[Hollywood]

If you have to reboot your computer for whatever reason to fix a problem, it is almost always a resource conflict. It happens a lot with NIC cards for some reason, usually because they take up the same IRQ as, say, your sound card. Whether your low on resources, well, that's dependant on your system. As for the moving back and forth, it could be due to latency, which results in lag when playing the game. Or, it could be a hardware related issue. If it happens all the time, well, It just might be a bug. As you can see, there are many possibilities, more then I can mention. Hope some of this helps.