I am trying to use a Samsung Exhibit 2 4G to connect to home wi fi. It worked fine for about a day then stopped. Nothing wrong with router or home network at all - other devices and other cell phones connect without any problem. The Exhibit now longer sees ANY wi fi network, at home, Starbucks.....none. I turn on wi fi, it does one quick scan, turns off. I try to manually add network and get the message "can't save network." I've done factory reset twice. I have tried to root using zerorushroot but it didn't take. I am a novice and don't want to make any fatal errors. Any advice is greatly appreciated.