Dear I have submitted my lumia 535 to Care center too, in Italy, but I can share with you more details: In my lumia, I disabled zoom and updated the phone to the last firmware (the one reported on this page). I found out that the touchscreen performances in the middle of the screendid improve, but at the top and bottom edges the situation was unchanged. This shows up a lot when tiping: sometimes when pressing a letter another one is sensed, and this does not depends from "not pressing
the center of the letter" as the one sensed is very far and sometimes freezes itself as if tapped continously. I disabled wordflow but the situation did not improve either.
The last important thing is that the touch menu does not have a sentitivity setting, so it's impossible to change this parameter as some users here have suggested. In mu personal opinion, it's as if the screen lacks isolation, and when taping/multitouching
it undergoes some dielectric discharge...
I hope my description can help in understanding the issue and to have some good news soon.
Ps: in the IT forum, a microsoft employee said that your team is working to solve the issue. Did it means a new update will be released?
thank you