Z-wave smartplug and lost devices

[pmniemiDomFor]

Hi,

I have two questiens related to Z-wave smartplugs and Domoticz:

1. My Fibaro smartplug suddenly is not accessible with Domoticz. Domoticz does not complain about anything and does the switching in the UI, but the smartplug doesn't respond in any way. When switching the smartplug on the physical button, however, Domoticz immediately also changes the state in the UI. How is that possible?
2. A Telldus smartplug can be switched using Domoticz, but I have lost contact to its devies for measuring power consumtion. In other words, it's not totally disconnected, but parts of it are unavailable.

Might these problems be due to me upgrading Domoticz (and thus I was also forced to upgrade to Buster)?

Can I do anything else but the obvious (i.e. remove them from the Z-wave network and reconnect them)?