I have owned my Galaxy S4 since they first released, and have never had any wifi connection issues until this latest update. The wifi connects, but the signal is so weak it won't even have one bar and it's just gray. It also keeps saying "your wifi connection is unstable." It happens everywhere that wifi is available, not just at my house. I've tried resetting the router and forgetting the network and reconnecting, all with no luck. Is anyone else having this problem? Is it the update or could my wifi antenna be bad? Really needing some advice!