Up/Down U and D keys work weird

Hi,

Ever since I started using Vim (years ago), I've noticed that (very)
infrequently, the Ctrl+u (up a half-page) and Ctrl+d (down a half-page)
commands behave strangely. For example, right at this moment, when I press
Ctrl+u, the page scrolls up 5 lines (instead of 25 or so). But Ctrl+d
works like normal. Wait, now Ctrl+d is doing the same thing! It was
working five seconds ago!

So you can see why this is driving me nuts.

Oooh, even more weird, it's misbehaving in ONE window, but not the other!
Same buffer, different window. And if I press Ctrl+W, R, to switch the
windows around, the behavior follows the window! In other words, now it's
happening in the left window instead of the right.

I've always assumed it was my terminal. But after three separate terminals
running in Windows, CentOS, and Kubuntu, it's happening in all of them.
What the heck key am I accidentally pressing that's putting Vim in
"act-weird-mode"?

Thanks!
James

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