Comment Re:Simple to do (Score 1) 172
Wifi repeaters were only defined for 802.11b. Many non-standard solutions exist for 802.11g and 802.11n, some of them work, some give problems.
Anyway, one of the likely root causes is the Hidden Node problem. Make sure any access points configured to the same channel are well out of reach of each other and only use channel 1, 6 and 11.
http://en.wikipedia.org/wiki/Hidden_node_problem
http://en.wikipedia.org/wiki/List_of_WLAN_channels