I have I9505 international. After kitkat update i noticed Signal and connection lost on wakeup .I tried dozen 4.4.2 roms all are stock i flashed at least twice.when phone is idle for long time (eg when awake in the morning ) and i unlock the screen signal is present....BUT if i connect to internet i lose signal. Aeroplane mode does not help. Restarting get signal back again. I tried different 4.4.2 roms and modems with no help. Any help is appreciated.