Mine does same. Wait a half hour, restart, runs good for 20 minutes and slows again. Just had it in for a tune up. Machine is only three years old.
My Toro did the same thing. I rigged it by removing the back cover (two bolts) and replacing the carb spring with a twist tie. I was sure not to have rev too high, be careful not to let it run while not in use. Keep it under load or turn it off. It actually throws the snow much farther than I expected. Also I think I blew out the muffler. I tried to get it fixed but no one had the answer, I think it's just poor design.
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