Same problem here. My phone nor headphone dongle wasn't near any water source. The port isn't recognizing I think. Cannot even hear music. What's the use of spending lots of money.? I request xperia team to look into this issue immediately.
A system app named something like usbsettings had to be wiped clean of its data on a Samsung S8 when it falsely claimed to be wet. After a reboot it worked. Maybe Sony has a similar USB monitoring app? Can't verify myself since I haven't gotten my Sony phone yet.
This problem started for me a few days ago. It was saying moisture in USB when headphones were plugged in but was fine when charger was plugged in. I spoke to support and they suggested repairing my software. This did absolutely nothing other than make me lose some data because the backup apparently doesn't capture everything. Being ex-IT support myself the information told me it's probably an issue with the adapter itself and not the phone so I bought a new adapter off of amazon for a few £ and it's working absolutely fine. The old adapter (the one I received from Sony) is still saying moisture so I think it's definitely the adapter. I hope this helps.
Thanks a lot !!!! Even I feel that that is the problem as the charger is working fine. I will replace the adapter soon. Guess this was a problem for all sony xz2 users who arer using the headphone dongle from Sony. Maybe a manufacturing defect I think, as I saw a lot of people asking the same question in the internet. Thanks a lot!!!! You just saved my life.
