Arrow keys intermittently doubling

[TravisE]

Has anyone else ever experienced a single press of the arrow movement keys sometimes moving the cursor two positions instead of one? I'm getting this quite frequently on my Prime, and it's becoming a nuisance. It happens with all four directions but not any other keys that I've seen. Roughly one in every few dozen times I press an arrow key (it seems random with no discernible pattern), it will move the cursor in a menu or in the editor twice for one press instead of once.

For example, in the program editor while I was trying to indent a block of code by repeatedly pressing down, space, down, space, this caused a line to be skipped every screen or two of code. I can also end up selecting the wrong item in a menu because the cursor did not move the correct number of times.

I can't be certain exactly when I started noticing this, whether it was like this since the beginning or whether it started more recently. I'm currently running firmware 10637.