I have had the phone 16 days now. First week was okay but this last week my WiFi has just been loosing connection like mad. All the time I had to toggle it to get it going after sleep. And even then it would loose connection multiple time pr
I found this post on XDA: xda-developers - View Single Post - SG3 Know Faults Thread
Basically what user 'Muskstick' suggests is going into service mode (*#0011#), hit menu button, select wifi and disable the power save mode.
It's been working normally ever since :-)