I have had quite a few issues with Hubitat and my GE/Jasco Z-wave plus Fan Controllers timing out with alexa and alexa not being able to handle setting to medium via the word "medium" so I have created an app that wraps the fan controller with a Virtual dimmer switch and propagates the events the the physical fan. It works quite well and wanted to share it. It also creates a Virtual switch named "[fan name] Medium" so alexa can handle the medium setting.
I have only tested this on my fan type but I did put in a setting for supporting 5 speeds instead of the 3 mine has.
Anyways click the link to get to the Github repository for the app.
Using the "Generic Z-Wave Dimmer" driver should resolve the "device is not responding" Alexa issue. Using this driver, along with Alexa Routines, should be a very simple workaround.