i think you just failed to pair all the adapters together. the link below really works, i suggest you try both methods http://www.tp-link.com/en/article/?faqid=258

The problem exists not only with TP-LINK. http://www.zdnet.com/samsung-acknowledges-galaxy-s4-wi-fi-connection-problem-7000015431/ As in this link, WPA TKIP or WEP has no problem. i tried WEP, it...