Oh, thanks! 
I suspect what John is alluding to here is that different devices have different behaviors in this circumstance. But since each zigbee device has its own permanent ID, it’s usually quite possible to simply reset the device and then re-add it without telling the network that you reset it. That way you don’t have to change any of your smartapps ( which use the network ID to identify the device). In most cases for a battery powered zigbee device this will cause it to choose a new parent if the selection of repeaters is different then the first time it joined.
(Note that this does NOT work for zwave devices, because their network ID is assigned by the hub when they join. For Z wave, you would use the “replace” utility in a similar situation. But you don’t need that utility for zigbee because the device’s ID is always the same anyway. )
People do this a lot for GE Link bulbs since those have a firmware flaw which can cause them to lose contact. The point here is simply that it’s very easy to reset them and add them a second time without making any smart app changes and everything will work just fine.
John can add more details if I’ve left something out for a SmartThings network.