K550i - No network coverage

I never did anything to the phone and it started this problem. It had some drops on the ground but i dont think thats the case.

When I look at the total timer it says 15"Square":02:32, so, its not displaying it properly. I think it is a GDFS problem.
The antenna works from time to time. When I turn off the phone and turn on again the Network signal bars icon disappear. After sometime or rebooting it, it reappears working or without any bars (but with icon).

I did a GDFS backup then I did a full flash. Didnt work. How can I repair the GDFS?
Thanks