escape key suddenly stops working

Using gvim 7.3 (2010 Aug 15) on Windows 7.  For about a week or so I will suddenly lose the ability to use the escape key.  I'll be happily vimming and it does nothing.  I can use Ctrl-C and Ctrl-[.  If I check the mappings it says that <Esc> is mapped to <Esc>.

I've been using this version of vim for at least a year if not longer.  This isn't a new computer.  I don't believe it's a plugin because I've tried running gvim without plugins.

I'm guessing it's something else on my computer messing with Escape, but I can't for the life of me figure out another program that uses Escape to see if it's only restricted to vim.

A reboot fixes the problem, but I'd rather not have to do that every other day (which is about the frequency of the problem).

Any advice?

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