This is another story. It may happen due to long distance, signal conflict or maybe your WLAN chip got weak.
Try with another device or router.
The signal is 100% and the distance is short.
I tried another router, ZyXEL NBG-419v2, FW=1.00(AACU.5)C0.
Same tests and all worked without problems. AR9002 got 150.0 Mbps and iPhone worked too.