I used to view and also connect to all the public WIFI network. Recently I am not able to see few public WIFI network particularly the Walmart wifi. First I thought it is something with that particular store. But one day I went with few of my friends and they were able to connect the Walmart Wifi. When I search for the Wifi network i do not see Walmart wifi. However, i see a walmart 2.5ghz wifi network which does no connect. Is it something with the 2.5ghz or 5ghz wifi connection ?