Share your experience!
I am using sony xperia p. From 3 days ago I have got a problem that when my phone got missed call after then automatically ringtone off and automatically vibration on. Even after that when I on the ring, I have found ring volume was lowest. It is continuous happening. About 1 week ago I have upgraded my phone to 6.2.1.10 and about 2 months ago upgraded from ics to jellybean. Please give me a solution to fix this problem.

Solved! Go to Solution.
I think I found of problem source - it's my antiviral application - COMODO Mobile Security. On some other (samsung) forums people talk about AVG that causes just about the same behavior.
I have a same problem on my Xperia V, same use - about 3 days. Can't find anywhere solution too((
It could be,antivirus is no need in Android.Just uninstall and enjoy the max of the phone.
Ya I am using comodo antivirus. Ok I am going to unstall it. 
Great... Thanks bro arsalan. After unstall comodo antivirus my problem solved 
don't be hurry, see this comodo forum discussion, and for a while you can just stop the app.
PS
and my correct name - Arslan 😉