I had a problem with a Gocontrol and Linearlinc lightbulbs dropping from my network after a power outage and restore. I think I solved it, posting here in case users are experiencing the same problems.
It's a simple fix:
1. Unplug Z-Stick from Engen server
2. Wait 15+ minutes
3. Replug Z-Stick
Key idea here is waiting 15+ minutes. This allows time for all active devices in the Z-wave network to go into "Child" mode, and then the Z-Stick will rebuild the mesh network tables automatically. I can't confirm that this is happening, of course, but network seems to be working much better. I also get better measurable response times and no errors on Engen's "Options =>Health" page, so there is an objective improvement there.
A more technical explanation can be found here:
https://community.smartthings.com/t/zwave-mesh-fragility/10897/5If/when Engen dev continues, perhaps a "Network Heal" function could go on the list. Thanks!