I have created a sling:OsgiConfig node with some properties under /apps/myproject/brand/config/brand.locale.configs as shown below. This is reflected in http://localhost:4502/system/console/configMgr as well with the same name brand.locale.configs
if a restart fixed the issue, it's likely a problem with the JCRInstaller, which is supposed to install any config change from the repo into OSGI. If you run AEM 6.4, you have a threaddump per minute, and you can check there if there's a thread named "JcrInstaller.1"; also check your error.log files if you find any messages indicating that you had an issue with the JcrInstaller.
Checked even when the issue occurred and the "pauseInstallation" node was empty that time. Now I have restarted the instance and the issue not occurred and not able to reproduce the issue. But my worry is what if the issue occur again in higher environments. Is there anything which I should check if the issue occurs again. ? Please let me know.