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Phone ringer starts ringing randomly but no incoming call

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Message 1 of 1

Phone ringer starts ringing randomly but no incoming call

My phone starts ringing xperia's default ringtone at random times but no one is calling nor a notification is displayed. I think this might be because of latest update to 9.0 because it never happened before that update. Its very annoying and i dont know how to fix this. Can anyone help?