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I have exactly the same problem as the previous user, only my phone was not in a jacuzzi with jets. It was in a swimming pool, where I try my best to keep the phone out of the water, and when it is submerged it is for very brief periods and not deeper than maybe 30cms. Here is the problem. As much as I like this phone, honestly it was my 2nd choice after the LG G3, but since the G3 was not waterproof I opted for the Z2. I now have the phone for 45 days approximately. Within the first week of ownership, I had to send it in for a faulty secondary camera. After a few days I received it back, only for the same problem to occur within a few hours. I then just downloaded an aftermarket phone application and used that in conjunction with the secondary camera. Now, this morning, I noticed moisture in the camera lens. And in the evening, with more than 60% batery power left, the phone just dies on me. I have tried all the "fixes"as per the Sony Website, and nothing works. It is a dead duck, a pretty paperweight. Now this is suppose to be one of the Sony Flagship models, and I have had so much problems in the first 45 days of ownership. And by the looks of it, so do many other people. To make matters worse, I am leaving on safari to Africa in 2 days time, and I was relying heavily on the Xperia Z2 for taking photos and video. Now that will also not be possible. This is turning out to be a very expensive mistake. And the only feedback I will get from Sony is "please send it to the closest Sony support center for further evaluation".
Check if your phone has the gaps manufacture defect ,that potentially happened as a result of a water passage through the gaps. I have gaps on my xperia and when I put it the first underwater the screen went crazy and the touch got damaged so I had to replace the screen and it worked fine again.