gbasile66 , Find below 1st link will show how to open your phone so you can inspect the wifi antenna, clean/reseat the connection and if need be replace it. You can do a search for replacement part if need be. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.youtube.com/watch?v=55AxThnMCXo
http://www.ebay.com/sch/Cell-Phone-Antenna-for-LG/43304/bn_161687/i.html?_fsrp=1