I've been having a lot of issues with my airport express lately. Suddenly it stopped working and I've tried to do a hard reset and factory restore several times. During a factory restore the light went from green to blinking yellow for about 10 seconds or more then after a while it just turned off while holding the reset button in. I kept it like that for another minute and let go and now it just stays solid yellow, occassionly blinking to green for a second then going back to solid yellow. I can't find anything on this and it still won't show up in airport utility. What's wrong?