to me, it sounds like condensation has accumulated in the brake fluid, frozen, and thawed, putting a TON of air in there, only fix is gonna be to pull calipers, drain every bit of fluid, refill, and bleed. its also a good time to get new brake pads and clean your brake caliper pistons as you should do every now and again anyhow. if that doesnt fix it, your master cylinder may need some love.
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