The subject device was not returned to omsc for evaluation but was returned to sorc.Sorc checked the subject device and found the reported phenomenon.Omsc reviewed the manufacture history (dhr) of the subject device and confirmed no irregularity.The exact cause of the reported phenomenon could not be conclusively determined.However, based upon the information from sorc, omsc surmised that the reported phenomenon was attributed to irregular stress such as twisting to left/right with angulation locked, suddenly angulation and so on.If additional information is received, this report will be supplemented.
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