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In this case, contact your Local support to have the device examined as Jake said.
Let us know how you get on with the this.
I had water damage in my Xperia Z3, and for what I had investigated there are lot of people with the same problem, check youtube.
In my opinion there might be a DESIGN FLAW with the waterproof in the Z3.
Customer service sent me a new unit, the problem is that staying without phone, even if it is for one week, is very inconvenient