Display/Touch Problems

edited September 30 in Others
Model: ZE500KL
RAM: 2G
Firmware/APP Version: mmb29p.ww_phone-13.1010.1612.53-20170202
Frequency of Occurrence: always
Rooted: No
APP Name: all apps and homescreen
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/202003/13/124828watvsstovpnsvnt0.jpg

sometimes screen frezes. after sleep and wakeup the screen reacts again but never in this strip (see picture)

what could be broken there?
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