Share your experience!
I've sent the phone to Sony for repair and it passed it checks. It came back with the same software faults AND the USB port flap still pops open on it's own and according to Sony it passed it's checks. No idea what to do anymore?!?!
Do you have any pictures of what you mean by this?
Also are Sony actually replacing this fault? Has anyone received their replacement back with it having been fixed?
The USB/SD card flap also loses its sealing after some usage. At the very least it protrudes a bit more than necessary from the frame.
I've seen it happen on two different Z3 Compacts.
Just FYI
I have also the same problem. Got new in the replacement but same issue with the new one also.
Please help
I have had the same problem with my Z3 USB flap.
It keeps on popping open .it tried the heating it up with a hair dryer trick .
It worked for a day.
I saw some where that you can buy a spare parts pack with all both covers .
But I'm not sure if the you tube video on removal and replacement is exact
I bought a couple of Z3C's for my wife and I, hers was perfect, mine had the problem of one of the covers not staying in place. It would go in, but within a few seconds would pop back out again.
DISCLAIMER: Don't blame me if you mess this up...
I used a very fine nail file and GENTLY rub it against the seal a couple fo times. Tried it again, it went in, and stayed in a bit longer but still came out. Gave it another little rub. Bingo, it's been perfect ever since.
A lot quicker than sending it off for repir 
Same here