Ran Symdiag and seems to be the recent windows patch behind this. As we are running on 12.1.x, symantec clients are getting corrupted and services getting stopped. As a consequence, clients are getting disappeared from SEPM client console.
We have upgraded to 14.0.3876 and after that , clients are showing in the tray but with warning though there is no warning while opening Symantec Client console.
Regards,
Anishk