I have the same model as you "7plymaple". I have the same problem. Before and after 4.3 update. Do you guys have flashplayer on your phones? Could that be an issue. The site we are trying to obtain could be flash driven.
After an update. You do a factory reset. With the wifi drops, how many devices are connected to that wireless router? The more devices connect. The more chance you will drop a connection.