Just wondering why when I am out somestimes and randomly try to connect via WIFI to an open wireless access point at lets say a CVS or a school,etc,etc. the acess point is not password protected and I can get on lets say Facebook but I cant acess anything or do anything...error message comes up stating unable to connect?? When at a Hotspot such as Starbucks or MCDonalds,etc. open access Wifi is perfect. Thanks...