Today, Sony Germany reportedly acknowledged this problem. According to German website Inside-handy, Sony stated that the issue only affected a low number of Xperia Z1 Compact units, and had been corrected in newer devices.
Unfortunately, it doesn’t look like Sony provided an official fix for users who may have been initially affected. Still, if you’re planning to buy an Xperia Z1 Compact from now on, the flash bleeding problem shouldn’t be a concern.
The Xperia Z1 Compact currently costs around $500 unlocked. It's not officially available in the US, but you can order it via Amazon. The smartphone was launched running Android 4.3 Jelly Bean in January, and an update to Android 4.4 KitKat for it is available since March.
source: Inside-handy (translated)