After the last update with the february security patch, I found difficulty in hanging up the wifi network from which you have strayed too far to stay connected. when returning to the covered perimeter, the network is not re-hooked. to hang up you must act on the wifi icon by switching off and then on again. only at that point the connection is restored.
I had the problem, but for me the problem wasn't the phone but my router. I called the service provider, they did something, and I didn't have the issue anymore.
