Hello, suddenly last week I lost connection to 2 Z-Wave devices in my network (A smart lock and a smart switch), and nothing would work to restore the connection. I tried multiple Z-Wave repairs, manually operating switches etc. The only thing that finally restored communications is I have temporarily moved the HE Hub next to these devices. However this is not ideal as the hub is publicly visible location, far from other devices, and is not on a surge protector. I'm not sure what happened that week to change the range of the Z-Wave network however I have two clues: 1- I updated the firmware on the hub to 2.0.6, and had a birthday party where some mylar balloons were left near those 2 devices. However, even after i removed the baloons and ran a Z-wave repair that did not restore communications. Can anybody tell me if either of these things (the newer version of firmware or mylar baloons) is known to affect Z-Wave range, or should I keep looking for the cause. Also, what affect would moving the hub have on the Z-Wave mesh? I know certain devices will have one more repeater in the path and certain devices will have one less, how long would it take for the mesh to figure that out? Thanks in advance.
I don't know how your devices are laid out but a Zwave network needs to planned out. Most often Zwave devices dropping off is just lack of a good mesh. If your devices are widely separated or have lots of wall, appliance, or furnishings between the hub and device, you need more wired devices in between to repeat signals back to the hub. The fact that moving the hub closer fixed the problem pretty much proves that. Battery powered devices spend most of their time sleeping and do not provide any repeating capability.
Thanks. Yes I agree, the evidence points to another repeating node is needed. However, I'm just curious and a little frustrated. Like many I was a former ST user, and never had any mesh issues with the ST hub. I started having them with HE, purchased 3 additional repeating nodes, and had no further issues until last week. Maybe it's karma but it seems like everytime I sneeze on the HE hub, the range gets shorter. 
You are never supposed to sneeze on the Hubitat Hub!
But seriously, one thing is to make sure you don't have a repeater device (like an outlet, for example) that is manually being powered off (by a wall switch, for example). Because it's powered it would likely become a routing node and when powered off that route would be unavailable. It should be able to recover from that but I don't know how long it might take.
The other possibility that comes to mind is the direction you are already heading - is there some form of interference or shielding.
