Different error messages mean different things. Some don’t matter very much, some matter a lot. See the FAQ:
Anything which does energy monitoring May have a problem during a repair just because these devices are really way too chatty for what the Z wave protocol is intended for. It’s supposed to be very tiny messages sent infrequently, like turning a light on and off. Once you start reporting every few seconds, you get a lot of traffic on the network and even the repair messages don’t always get through because the device is busy.
If it’s an option, turn off energy reporting on the device before you run the Z wave repair and that might help.
If you have persistent problems, contact support and they may be able to see something from their side.