My XZ1 has the same issue. After stroking the screen several times, horizontal lines and dark stains appear on the screen and disappear completely after around two minutes (the more you rub, the longer they disappear). All pictures have been made when phone was displaying gray color. The phone was in repair two times. Before first repair After first repair First "repair" was fairly fast - 5 business days. After second repair The second "repair" took a little bit longer - 11 business days - because they were waiting for replacement parts. In documentation, service included the following information: Due to the characteristics of the display, some models may have strip patterns due to electrostatic action. This is not a functional defect and the strips disappear with the disappearance of electrostatic charges. Summarizing, I was without a phone for a month and nothing changed. I'm not satisfied at all. Luckily these patterns don't show often. In my use only after cleaning the screen or swiping very fast.
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