Netonix Manager fails to restore config files

[Banana Jack]

We use Netonix Manager v1.0.24 to backup config files for around 100 switches. Occasionally when a switch in the field goes faulty, we download a config backup from Netonix Manager to use on a new replacement but in recent times the target switch simply reboots and the config isn't applied. This used to work really well so I'm not sure if something changed? We ensure that the new switch is firmware upgraded to match the one that the config file was taken from. If anyone has any ideas how to make it work again, it would be great to hear.