Hi, I have this problem. The screen sometimes turns black all of a sudden, then it slowly return to normal brightness.

Anybody experienced the same?

After a update failed logo and reinstall the software on my phone using PC Companion (both time use PC Companion) .the second time it just install the software from scratch without backing up because it failed the first time around. The wifi seems to be working so i just let it download programs from google play. This morning put in a sim card and discover that mobile data did not work. But calls can. The sd card also fails to read. Revert back to my S5 and typing this . Need to try anything else before going to service centr?