Connectify not working properly?
Use a portable small utility mHotspot instead of Connectify. Connectify does have such type of issues. So, mHotspot is my all time favorite when it comes to creating virtual hotspot.

If you're unable to connect for the first time (which shouldn't be case as you were able to connect with AP of Connectify), reload the Wi-Fi driver by dialing *#*#526#*#* or install the "wifi-fixer" app from Play Store.