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I used them on an older Xperia T LT30 running on 4.3 no problems at all...
So is the Z1C not the headphones.
Anyone any sugestion?
Thanks
Did a full update service.
Problem still there... 
Could it be that the head set I have has some jack problems?
Any ideas?
I'll try got to Sony shop and check on another device.
Thanks,
T
Went back to Sony shop and they confirmed is a Sony and Kitkat issue. So I am stuck with a pair of headphones that I can not use. The weird thing is that it works couple of minutes and the gone.
Hmmm