Well, the only reason how I found out my unit is facing the problem is because I was under such circumstances, so it isn't that uncommon. Most people find they have this problem when they're reading at night and have to set brightness to low..and I'm pretty sure bad Wi-Fi signal is not that uncommon. That's not to say it won't happen in more common situations too...it just so happens I found out its easiest to cause the screen to flicker under such circumstances.