Sony confirms issue with Xperia Z1/Z1s touch screens and coming fix with Android 4.4 update
I recently got a Sony Xperia Z1s from T-Mobile here in the states. Despite the slightly dull screen, it was my favorite of the available phones. Unfortunately, the phone I got as well as the one my girlfriend got have an intermittent touch screen issue. In attempting to research and troubleshoot it, I was able to confirm that it is an ongoing issue, that Sony knows about it, and that a fix is due in an upcoming firmware update. Unfortunately, Sony does not yet have a release date for the update.