We place the fail unit in QA lab to reproduce this fail symptom. At this moment, total 600 loops and CND. We will keep this cycling to this weekend to collect the fail rate.If we can reproduce the same fail symptom with production line. This issue may related to system defect. We will send this fail unit to WS for analysis.If we cannot reproduce the same symptom with production line. This issue my related to production line environment. We will focus on the image content, USB dangle etc. to analysis it.