I wouldnt really blame a board for ejecting on icy snow. If a board isnt at least a little bit embedded into the surface, it can definitely do that. I’m no snow exoert, but I used my boards on several snow-stuck trucks back to back last winter. If I hadn’t roughed up the i ece, they would have shot out.
Bogging in sand is different because you’re usually in a “hole” your tire created so it stays put better. But icy snow can mean youre stuck on a perfectly flat surface...with nothing stopping the board. On icy stuff, ya really gotta use the end of the board (or some other object) to rough up the surface if you can so the board can grab a little & even if you do, don’t let people stand behind the tires. :-0
The other goofy thing is sorta the opposite problem—where in soupy mud or powdery sand/snow— Tbe board can end up “injected” under the surface, and suddenly you can’t find the dang thing.
-That’s why MaxTrax come with tethers, or “leashes.” You attach the leash in that setting so you can find the board if it knifes under the soft stuff. The leash will usually stay visible and help you find & pull it ouf of the goo.