Do Slider Dimmers "Weaken" over time?

I have 6 x 65 W recessed Halo ceiling lighting fixtures on a 3 way circuit including one slider dimmer switch. It's probably 10-15 years old. The dimmer part seems to work OK vis-a-vis dimming, but when the slider is up at the "off" position, it doesn't seem to be restoring to full 100% brightness. Should I just replace the slider or am I dreaming and just need a new eye exam?
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