I got my MBA about 2 weeks ago, and in 3 different occasions some windows and parts of the desktop would show display artifacts. I am attaching snapshots. I didn't recognize any specific pattern that could cause this, and the CPU was not overheating when the fact happened. Every time it was sufficient to reboot the system, and the problem disappeared. I am worried it might be a hardware issue, maybe related to the integrated graphics. Should I have the MBA replaced?