Walk Behind Lawn Mowers

I bought an HU775H 22" (Husqvarna) walk behind rear wheel drive mower in February 2012 from Lowes. The drive system seemed weak early on so I began to adjust the drive cable but it has not helped. Apparently there is a flaw with this type of drive system. What are my options. I have noticed at the local Lowes store, there has been several returns on this mower. If this issue cant be resolved by the manufacturer, This will be my very first and very last Husqvarna purchase. The mower has only been used one season and problem was appearing early on.