My L34C started exhibiting the same behavior a couple of weeks ago. It got weirder, the wi-fi icon in the quick settings/notifications panel would animate (the 'waves' would pulse) but the icon wouldn't change color (to blue for connected) and also wouldn't let me enable wi-fi. I ended up doing a hardware reset, but I also (just) received the following response from Straight Talk. Hope this helps (my added emphasis):
Please be informed that the new "My Account" Application on your phone will connect to any eligible Wi-Fi network automatically. The feature searches for connectable Wi-Fi networks, and turns on the phone’s Wi-Fi antenna to connect to the network, so even turning off the phone’s Wi-Fi will not disable this feature.
The Straight Talk "My Account" application also helps provide a better data experience by automatically connecting to available Wi-Fi hotspots whenever you are near them. The application performs a test of each hotspot to ensure that you are only connected to quality hotspots.
However, if you would like to remove remove or disconnect the Wi-Fi feature from the application, please respond to this email with your request. For immediate assistance, please contact us via Chat or contact one of our customer care representatives at 1-866-667-6470 and enter Reference PIN ######. Moreover, the Reference PIN is valid only for two weeks. For your convenience, our representatives are available Monday-Sunday from 8:00 AM to 11:45 PM EST.