Thanks! This worked on my Galaxy S3. It was annoying because sometimes the wifi wasn't available, but the phone kept thinking it was, so wouldn't refresh my feeds. Perhaps this is why my weather updates are so slow to update. I want wifi when I want it, not when the phone thinks I do!
Looked interesting, but there is no such option at that location. No auto-connect or not. S3 is up to date. WiFi keeps trying to turn on when S3 is being used as a WAP, this disrupts the WAP. It is kinda important to me because G3 WAP is the only way I can get email to my laptop in this country (I am in Solomon Islands)
Go to Settings > (Wireless and network) More settings > Mobile Nettwork > Automatic connections > Uncheck the top option.
If you want to keep your wifi hotspot and disable connections optimizer only, do the following
Go to Settings > (Wireless and network) More settings > Mobile Nettwork > Connections optimizer-> uncheck Sprint Connections Optimizer box