Screen jerk and random touches I am using lenovo k3 note with updated version marshmelo 6.0. Sometimes it happens like random  touches appearing on my screen and screen jerks many times. I have restarted my phone many a time but it happens several time in a day. I don't know what I should do. I am using this it since 1 year.
Looks like your screen and the digitizer are going bad. Maybe there is moisture inside your device. I am no expert but if this is the case try to dry it with hair dryer