From a couple of week my S4 i9505 start to lose signal.
Everything else like WiFi, SD card, usb...is working..
My carrier have changed my sim with no result.
I have to shutdown and start it again a lot of time before it recognizes the sim card again.
I'm using a stock Google rom and I tryed a lot of different modems without no success.
Try to change rom, try to clean sim card... no results.
I search... no results...
Anyone have had the same problems?