According to a message from support, the Cloud had “hiccups” yesterday. Not a local mesh issue. Many people reported multiple issues including missing and duplicated messages.
Also, zigbee networks are easy to heal. They don’t require a special system utility like zwave does. Just unplug the hub for 15 minutes (.including off battery). Then repower it and over the next day or so all the routing tables will automatically rebuild.
Also, zwave plus does have longer range than zigbee in ideal conditions, but they’re both in the same range in a typical home automation set up, and zigbee does travel slightly better through water, both rain and water pipes. So range is not usually a big differentiator unless you’re trying to go across an open field on a sunny day.
See the range and repeater FAQ for more information: