Disable visualrf engine from VisualRFSetup page and wait for few minutes for service to stop.
#psg java
look for Visualrf_startup.sh service, once it stop and not listing. Remove visualrf bootstrap file
# rm /var/airwave/cache/visualrf_bootstrap
Restart the engine
Parallel check system>performance page for RAM/CPU usages, if system completely utilizing memory and start using swap then we need to check what service taking more resources and need to increase resources if it is not assinged as per server hardware guide recommandation.
Always recommanded to stay on latest code !