Hi, Sometimes my phone does not ringing so i missed some calls. That is it takes 4-5 seconds to screen-up and ring (ie. ringtone delay) even i set sony's default ringtone. At the caller side they hear calling sound before my phone starts to ringing. It actually happens sometimes only. I dont know why it is. I searched many sites and forums regarding this problem but didnt get any correct solution for this. Plz help me.
Sony Xperia Ion LT28h
Jelly Bean 4.1.2, Stock FW, Build number : 6.2.B.0.211
LB, rooted with cwm recovery.