Galaxy 3 automatically turns off and on
The WiFi Analyzer will not help you. It's only used to test and show information for the wireless signals around you. I found a forum with several suggestions, one will probably work for you. Click here to go to it. There are many things that could be causing the issues (too many for me to list) but they cover many troubleshooting techniques there that might save you a trip to a service shop and get your S3 back up and running in a couple of hours. Good luck!