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Sounds like your ignition timing. If the blade hit something solid while cutting it might have bent the shaft or sheared flywheel shear key. This is not hard to replace, just remove the engine cover and flywheel. If its not that, it could be inside the engine and that would be a bigger job Stephen.
from the sound of what you are describing the piston/rings/cylinder are damaged in some way shape or form this causes compression loss in the engine, and allows oil to enter the combustion chamber, in this case a new lawnmower would be in the near future
Depends on how it cuts off. If it gradually slows down over a few minutes or surges, it's likely the carburetor needs to be cleaned and rebuilt. But if it's an immediate cut off, it's likely to be a safety switch such as the one that shuts down the engine when you get off the seat if the mower is running. Sometimes this happens frequently to a light person who bounces on the seat when mowing.
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