3340 Latitude Touchscreen Issue

Purchased a large number of these laptops and I am having several problems with the touchscreen not working. The laptop doesn't even see the hardware. I reloaded the OS, re-seated all connections and it still does not fix it. With the screens on back order, can anyone tell me if they have had this issue? Out of the 10 I repair a week, 8 are touchscreens not working. Is this a known issue?