I experienced this issue last night, where the screen starts scrolling to the left, displaying pixelated gibberish. I did a search on the inner tubes and found this:
https://www.reddit.com/r/electronic_cigarette/comments/3myosm/evic_vtc_mini_screen_problems/?
It only happened one time with me so far; intermittent issue, I’m guessing. Hasn’t affected performance…it was just annoying and spooky!