If it’s the snow blower sometimes snow gets stuck and packed behind the auger and just need to scrap it out. Obviously when blower is off! My brand new ego snow blower clicked on second use and was vibrating a bit. Worried me but it was just packed snow inside the auger area. Once cleared sounds just like new again. Make sure to get an extra scraper bar to always have around. Mine looks halfway worn out already and used 4-5 times. They should include an extra scraper bar with a note inside (scraper bar needs replacing often. Always have a spare around). Doesn’t seem like Home Depot stocks them in store which is really dumb since you have to wait to get one and I can’t just go in and pick one up when I need it.