I have three of this units and have seen this few times before fitting the external z-wave antenna to my Homey.
Indeed, not described in the manual. But each time I was getting blue-blue-red was not triggering any of the associated flows. So I guessed was telling me that no communication with Homey.
This hasn’t happened since the external antenna, thought.
I would try a couple of things:
Go to the dev tools https://developer.athom.com/tools/zwave and perform a heal having the quadmote in the final location. Make sure you wake up the Wallmote by pressing the button just before you press Heal. If successful then you should see a message in a green box. Then just see if your issue still exists.
If the above fails, then just have the Wallmote close to Homey. If it works all the time you know that there was a communication issue so maybe you need more z-wave mains powered devices as repeaters or an antenna like I did
Hope this helps.