BA might be on to something...its Raynaud's disease
As for phile, I was also thinking lack of good arch support...maybe boot and binding smashing down the instep too much and not having enough arch support under your foot. Also while standing in line and the ride up...loosen your binding straps and then ratchet it back down at the top. Also do you have a history of foot or ankle injury or sprains that can also involve nerve damage.
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