I've seen this sort of thing happen before and it involved too much heat applied to the boot melting the thermo mold footbeds which curled up on the end and jammed up the toes. Just saying, best to check the easy stuff first.
I've never known a liner to shrink but a lot of heat might I suppose. Yes you can stretch a liner but fitting one season and not the next seems something else is likely at play.
It's not so much the model year, it's the high mileage or meterage to keep the youth of Canada happy
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