replaced digitizer stops working

i replaced both lcd and digitizer in my tf300. when i booted back up it works fine for a while. then the digitizer stops working. att first i thought maybe the whole pad froze, but i can use the pad with the mouse on the docking thing.. reboot it and it works fine again for a while. anyone have any ideas ?? i have reset the pad to factory + updated it and rechecked digitizer connectors and cabel.