Gps problem

I want to start with a premise: I've searched for this problem everywhere in this forum, I've tried every fix app on play store, i've tried modifying gps conf both manually and with the instructions of this thread http://forum.xda-developers.com/lg-g...onfig-t3098819. My gps works sometimes for a few seconds then it looses signal, but most of times gps only looks satellites without fix. Is there something more I can do? Thanks :(