This has been going on for a while and thankfully it does not seem to be particularly widespread, and the good news is that if you are an Xperia Z5 Compact owner, Sony has officially acknowledged the problem and has promised that they are working on an update that will be released soon.
According to a Sony rep on the forums, “We are aware of reports of a limited number of customers experiencing touch input issues on their white Xperia Z5 Compact devices. By gathering information and analysing returned devices we have found the root cause and will release a new software to improve the user experience on your white Z5 Compact.”
Like we said it is odd that only the white version was affected, and that it is a software problem and not a hardware one. Either way the update is expected to be released at the beginning of week 44 which is basically next week, so owners of the device should keep an eye out for it.