Hi all, thanks for sharing the information and opinion in the discussion. I have some information to add on.
The service advisor/CnC did mention about DVR may cause the voltage/current unstable. Especially those low quality of dvr. Initially, I don't buy his commend until I disconnected the dvr. The situation of jerking reduced and until no more jerking.
But the problem occurred again after few weeks. Now, I have disconnected all the USB device, dvr and Sharp ionizer. Still un-solved. Decided to send CnC for further diagnose on last Thursday, 20-Sep. At the end, I cancel the appt as not single jerking from 17th to 20th.
I'm afraid CnC not able to find any problem after send in and wasting my time. Perhaps, have to monitor and wait until more serious issue.
Thanks again for all the feedback.