10.7.3 - Screensaver turns on while I'm in the middle of typing/mouse activity

Has anyone seen this? Let's say I set my screen saver to activate after 5 minutes. Well I can be typing and using the mouse almost continuously for a period of time (5 minutes? I'm not exactly sure) and all of the sudden the screen saver turns on. If I'm in the middle of typing the screen saver then goes away almost instantly but I lose a few key strokes.

Is there an option I need to set to say don't turn on the screen saver until 5 minutes of inactivity? Or is this a bug?

According to Apple Support:

If you use a screen saver, it starts automatically after your computer is inactive for a time. You can also choose a shortcut so your screen saver starts when you move the pointer to a corner of the screen.

1. Choose Apple menu > System Preferences, click Desktop & Screen Saver, and then click Screen Saver.

2. Open the Screen Saver pane of Desktop & Screen Saver preferences

3. Click Hot Corners. Choose Start Screen Saver or Disable Screen Saver from the pop-up menu for a corner you want to use; and then click OK. To use the Command (⌘), Control (^), Option (⌥), or Shift (⇧) key together with a hot corner, press the key while the pop-up menu is open. For example, if you press the Shift key, the Start Screen Saver command changes to ⇧-Start Screen Saver.

To deactivate the screen saver and return to the desktop, press any key or move the mouse.

Additional screensaver configuration options for Lion are listed in this Apple Support KB.

This issue could definitely be a bug, but you could also check your screensaver configuration to determine whether you've turned on hot corners - it's possible that your mouse pointer may have triggered the screensaver. You can also choose to disable screensavers completely to avoid this issue.

I am having the same issue so can confirm it is a bug. I've disabled my hot corners just to make sure I'm not accidentally hitting them. I had my screensaver set to 30 mins, and it seems to happen every 30 mins. So it seems that the computer thinks I'm away, even though I'm using it. This is reproducable by dragging the slider from 30 mins to 5 mins, the screensaver comes on automatically before I even release the mouse (from sliding the setting from 30 mins to 5 mins)

This is one strange bug.