Holding down the Alt key for several seconds makes keyboard behave strangely

When I hold down the Alt button on my Keyboard for my than 5 seconds, my keyboard and mouse starts acting very strange. For example, when I try typing, none of the typing keys work. Some buttons do strange things, for example, Esc causes windows to minimize. When I click in my code editor (Sublime) it leaves a cursor in every spot I click. Lots of other weird behavior happens.

The only way to get out of this mode is to press Alt again (this time just for a moment is OK)

Has anyone had a similar experience? Is this unique to my computer, my hardware, etc?

Btw, I have a Microsoft Comfort Curve 3000 Keyboard, which I'm very happy with.

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