Leaf Blowers

I bought a 150T back pack blower 2/3 months ago. I had nothing but great experiences with it until a few days ago while using it to clear my patio, driveway after mowing my yard it all of a sudden had a sudden reduction in air velocity. engaging the throttle does not have any effect. I drained the fuel tank and replaced with fresh fuel and ensured I had a 50:1 mix, but after restarting the blower only has a less than half the air velocity output and this is unchanged even when i increas the throttle lever. Should I return it to Lowes for a exchange?