Work normaly and in any moment it turn off

Hola Guate ;]

display cable is probily loose. Seen this problem on another model.

Don't know if it's the same for the V3, but you have to make sure the screen cables are well connected. this is how it goes with a different model: Open the back of your phone, and near the top right side is a cable that leads to the screen. Make sure it is fully in. If this doesn't work, open the face of the phone, carefully remove the metal peice that is on top, there are small white latches on the side. After that you should just see the red-brown cables of the screen. To the top right corner there should be a cable that looks alot like the one in the back. Make sure that is all the way in.

Good luck, tell us how it went in there...