If the belt stays on as long as it doesn't slip, then the alignment must be good.
Flat pulleys are actually slightly crowned. The crown acts as a constantly self correcting ramp for the belt to climb up. Don't ask to explain it, it just does...
Stop the motion, and the self correction stops, so the belt slides off instantly. If it has to climb over a flange, that starts stressing the lacings, stretching the sides of the belt, reducing the driving surface to just the center or encouraging the belt to run off the edge.
If this has happened repeatedly, the belts may need to be cut and relaced, especially if the edge lacings are damaged.
Attack the slipping problems first though. Why is it slipping? Dull blades, loose or bad bearings? Feed too fast, too deep? Is something changing about the geometry when it is under heavy load?
You can try flat belt dressing, but sometimes that is more trouble. Anything sticky will attract dust and build up, making the problem worse.
I see raw linseed oil (not boiled) as a recommendation.
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