I'm pretty sure the developers are aware of that issue, but it's probably a devious gremlin with a lot of experience at evading the bug squashers, so has been part of HL for a long time now.
As Shadow suggested, restart HL any time the gremlin takes in interest in what you're doing. The restart has a built in lullaby like quality, and it soothes the gremlin into a peaceful sleep, at least for a time.
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