You can face a situation when defined GROUPS are disappeared or otherwise not defined GROUPS are appearing after the COLD start of CA SYSVIEW.
Here is an example: After the COLD start of SYSVIEW when use GROUPS command you may notice WORKLOAD GROUPS that wasn't defined in PARMLIB member(hlq.CNM4BPRM(GROUPS)) and if you use RELOAD command without specifying any parameters WORKLOAD GROUPS disappeared.
Release : 15.0, 16.0
NOTE: If you are adding WORKLOAD GROUPS dynamically, use SAVE command, that will save them to DATALIB and make them available after product restart. Also, if you are changing the start type from WARM to COLD and start seeing default WORKLOAD GROUPS instead of your own, use RELOAD DATALIB command to get what is stored in DATALIB