background:1852I in ME mode. 1702I flash to correct version as matrix list.from 8.10 , 8.8, 8.5 , until 8.2used JPN , JF10 until JC15.both have the problem on 1702I joined in vWLC on 1852I, "%DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to xxx....