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Hi, I got Xperia M2 recently 2 weeks before. From last week I have observed that all the notification sounds and songs played via speaker are being played from internal speaker. I am missing all my calls. I tried everything, I have even repaired using PC Companion even then the problem persisits. The sound is switching between the internal and external speakers whenever the phone wants to. Please advice. Till last week, I was very happy with the phone but now I feel that my decision of buying sony is a very bad decision.

What if you clear the Walkman data?
Go to settings click on apps click on walkman click on clear data
That seems to be a hardware issue, contact your local Xperia Care
From yesterday, I have disabled the stamina mode and the sound is coming from external speaker if I am playing music or if my phone rings...I think there is some glitch with the stamina mode...
If I was you, I would repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
Try the above suggestions