If it turns out to be a fault in manufacturing, they have offered a credit in the past for bad material. But…the faults tend to be visible vugs in the material, not a failure to cut through in one pass. You always have the option of sending a second cut to make sure the cut is complete before removing the material from the bed…if you don’t shift the backing material between the cuts, the second pass will finish the cut perfectly. (I pin down the material with the honeycomb pins to make sure it’s always flat, and if it doesn’t cut through completely the first time, a second pass takes care of it. You can use a little piece of rolled up tape to lift the cut to see if it is complete, or there are other methods if you are interested.) 
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