cc2541 OAD无线升级会断开连接

OAD无线升级我点start升级，会断开连接，怎么回事
16:24:11.475 > Firmware revision: Firmware Revision
16:24:11.475 > OAD support detected
16:24:16.717 > WriteCharValue[2902]: v=0001
16:24:16.920 > WriteCharValue[2902]: v=0001
16:24:17.169 > WriteRsp[2902]: status=0 pduLen=0
16:24:17.169 > WriteRsp[2902]: status=0 pduLen=0
16:24:22.644 > OAD started
16:24:22.662 > Notification[FFC2]: status=0 n=2 00 00
16:24:22.663 > WriteCharValueNoResp[0000]: v=00 00... n=12
16:24:22.671 > WriteCharValueNoResp[0000]: v=01 00... n=12
16:24:22.672 > WriteCharValueNoResp[0000]: v=02 00... n=12
16:24:22.673 > WriteCharValueNoResp[0000]: v=03 00... n=12
16:24:23.191 > GAP Link Terminated: status=0 h=0 reason=0x08
16:24:23.207 > SimpleBLEPeripheral disconnected