For the past couple of weeks, my laptop has had a strange problem where it looks like Ctrl+Z is pressed, so I usually lose bits of text I've just typed. If I redo by pressing Ctrl+Shift+Z, the text comes back, proving it's really as if Ctrl+Z was pressed.
It's difficult to see a pattern; I can be undo-free for hours, then get a few within minutes, sometimes 2-3 undoes at a time. Very frustrating!
I'm running Windows XP SP3 on a Dell Latitude D820 laptop, Clamwin antivirus.
I've tried another keyboard, no difference.
Any clue on what this could be, or how I could trace the problem?
Update: I've tried a few things that were listed or linked to on this page but nothing helped. It does seem though to point to a Dell laptop issue. I've upgraded the BIOS and other drivers, but still have the problem.