It's been a few months that this has been happening on my S4 GT-I9500 and it's driving me crazy because i haven't been able to find any solution online yet.
When my phone reception is on EDGE, the S-View Screen (Black screen with the clock on the upper part) starts randomly flashing every few seconds or few minutes depending on how much it feels like driving me crazy. I've googled the issue and it seems some others have it too but no solution found.
Here are the things i tried with no luck:
-booting in safe mode
Only thing I think i can do is flash CM or some other AOSP ROM, but personally, I don't feel they're stable enough for daily use yet (for me at least)
Does anyone have any other ideas on how this issue can be solved? Should i send my phone in for repair? All the sensors including the magnetic sensor are working fine if I use the S-View cover and this issue only happens when my phone is on EDGE in bad reception areas.
Any help would be much appreciated.