Just experienced the same problem. While floating on a raft at my pool, with the phone at or near water level, water entered the phone through the SIM slot, a slot I've never opened or closed other than to insert the SIM at initial power on. I have replaced the charging port cover 2 times, however, and the constant opening and closing surely weakened any seal this area may have had. I have indicated to Sony this is surely a design flaw, the power port cover, and requested a magnetic charger. I've been told it is possible a magnetic charger may be included in future Z1s's sold, but not mine. But as to this issue, before I entered the water, I checked all port covers, and they were as secure as secure can be. I didn't even press any buttons, I just wanted to listen to music. Within 5 minutes, the phone had turned the screen on, and had stopped playing music. I pressed play again, and then shut the screen off. Did this about 4-5 times, and then 3 buzzes, and off it went, never to reopen again. Sony clearly must know this phone IS NOT WATERPROOF and MUST STOP ADVERTISING IT AS SUCH. I am using my TMobile warranty, and will replace the phone, but I WILL NOT LET IT NEAR WATER EVER AGAIN. I am very disapppointed with this product, not only for this issue, but for the 'shatterproof' coating the phone has which scratches easily and leaves a thousand fingerprints all over it. Add to that the fact that TMobile carries NO Sony accessories, and I'm not a satisfied customer. I simply expected more from Sony. Note: My local TMobile no longer has the display with the phone on a rack so the phone can be submerged in water, and the rep who sold me the phone is missing his charging port cover, and now says he'd wished he'd purchased a different phone. Great salesmanship, poor phone design. But for not being suited for the purpose for which it is advertised, I loved my phone. Loved. Now, not so much.
