All my old pics seem to be vanishing from WhatsApp even though i have not activated disappearing messages for most of my chats.. Whenever i receive a call, it comes as a missed call.. my phone doesn't ring most of the times. When i am on one call and then take another call the calls at times just hang. At times downloads just don't take place.. it shows its downloading and nothing takes place. Uploads too take ages. Rectify this and I will improve your ratings.