sorry, all.
yes, I can find a lot of solution in the forum. After reading a lot, I use "smc -stop" and "smc -start" that can solve my problem. It become normal. Other final suggestion is to reboot the machine but no good at all.
1. No log in Windows event log or SEP client. ( no idea when start this error )
2. No log or warning in SEPM (not correctly show the status of client at all)