Maxxmar

In 2 years we have had the clutch which is just made of plastic fail 3 times. We have had it replaced once by MaxxMar after about 30 uses and once by ourselves when they sent it up to Lowes and now it has failed again so that we cannot pull the blind up. Lowe's says MaxxMar will not refund the money so we can get something better so we wait again for another clutch that will likely fail soon. There is a lifetime warranty but should we have to take advantage of it every few months