Several users in Apple's support forums are reporting that the iPhone 5 screen flickers when the keyboard pops up.

In fact, it happened to our own iPhone 5 screen last night. The bug appears to be a software glitch, as it only happens when the keyboard launches. The on-screen image distorts with jagged lines, sort of like an old TV trying to find the right channel frequency.

We've heard from several people that the bug only happens when you launch the keyboard in the App Store, specifically when you enter your Apple ID or password to download a new app. But we've been unable to reproduce the glitch since last night.

There are several videos on YouTube demonstrating the screen flickering. You can check them out here, here, and here.

We've asked Apple for comment and will update if we hear back.