Xperia Z1 Compact external speaker problem on KitKat 4.4.4 Build 14.4.A.0.157

[Raggs77]

I*upgraded to 4.4.4 Build 14.4.A. 0.157 about 2 months ago, now all of a sudden the external speaker has got very low sound, almost nothing can be heard and some audio files play through the ear speaker. I've read everywhere bout issues on 4.4.2 but nothing on 4.4.4. I have already done a factory reset but didn't help. Any help would be much appreciated, as I miss calls an messages.

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