Share your experience!
Stop by your local sony and have it replaced:
http://www.sonymobile.com/global-en/support/contact-us/
You could replace these yourself and wouldn't cost much to buy a full set of flaps/covers - eBay and Amazon sellers have them
My z1 came whit a charging dock in the box... It is very useful because you don't have to open the flaps every time you charge the phone and the flaps have a longer life duration.
So i recommend a charging dock for charging, and it's also looks nice on the desk.
www.sonymobile.com/gb/products/accessories/magnetic-charging-dock-dk31/