As @neonturbo said, Zigbee supposedly does it automatically ever so often or if you shut down the hub from settings and unplug it for more than 20 minutes it should force the Zigbee devices to repair when the hub comes back up.
Let's think about this for a moment... what happens when you turn a piece of a component off? You get lots of errors filling up your logs and using your processing power looking for the device you turned off. It's actually better to turn off the entire hub for 20 minutes or better and avoid overwhelming your hub with errors telling you that your zigbee is off.
Besides, giving it a rest is better on so many different levels if you want to give it a fresh start. You could essentially end up not solving your original issue and stacking more problems on top.
I've done it once on purpose. I switch zigbee channels on my second Hubitat from 23 to 15. And after several hours most of my sensors were still unresponsive. So I shut off the zigbee radio for 20 minutes. They popped right back on, Sure was was easier than resetting/re-pairing.
Does anyone have any data on disabling the radio vs. shutting down the hub? From a Zigbee device perspective, it seems to me like they wouldn't know the difference, and from the hub's perspective, you disabled the radio, so it should know (unlike when your stick goes missing or the Zigbee radio goes offline because some runaway app/driver took over your hub or whatnot). Shutting down the hub would, of course, also impact the Z-Wave radio (maybe not if you have a Z-Stick on battery?), which is picky enough for me that I'd prefer to avoid anything unexpected there if possible. Again, just thinking out loud about what, if any, differences there may be.
I had a conversation about it once with Bobby. He recommended powering down when doing this. He said it's all around easier on the hub. He said why not give it all a refresh at the same time instead of opening the hub up to other problems. Makes sense to me. I can live without a light turning on for 2 minutes. If you think about it, nothing will work right anyway when it's a mix of zigbee and zwave, so why does it matter if you safely power it down. Of course it's more the inconvenience of having to actually go to the hub to power it back on that is the underlying issue.