Check this video:
There is an email address for Eight Cig in the description to contact and arrange a replacement if you are having this problem.
The screen glitch/overheating issue is common (I'm on my fourth replacement now). According to Vaporesso, it's an issue with interference from the PCBA affecting only a few in the first two production runs, but by the number of comments/messages I've had from other having the same problem, I'm not sure about that claim. I've included the email I got back from Vaperosso (they only responded after I sent them a link to my Youtube videos)
From my experience with the 4 I've had to date... When the units are affected by this problem, you may notice intermittent 'low power'/no hits (especially while running in TC mode) with a fully or almost fully charged battery. When the battery actually does get low (seems most often between 20-30%) the screen will glitch and go crazy. You can clear it by removing/replacing the battery, but if you leave it with the screen messed up, it will overheat behind the display. It's happened twice to me now when it started to glitch and I didn't realize right away, got quite hot both times. Hoping they come clean and get the faulty units replaced before someone has a real bad problem. Since it only happens when the battery is low, I'm not sure if it will have enough juice to actually start a fire or anything (just a single 18650 thank god), but if someone were to plug it into the pass through charger without noticing it's glitching, it may become a real problem.
The latest replacement they have sent me is arriving today. I will test it thoroughly and I will post an update once that is done. They say this one is from a new batch, and that it won't have the same problem as the rest. They've passed along to me that anyone seeing this problem should email and arrange to have the unit replaced.