Hi, thanks for the reply and yes I’m certain its not Bluetooth related. I’ve made sure no other devices are stealing the connection (although thats not so important on the kickr anyway as it supports multiple Bluetooth channels). I’ve also tested using Ant+ and get exactly the same issue.
I got 3,066km and 7 months out of my Kickr '18 before it ate itself with this exact problem this evening. I guess I’m now in the queue for Wahoo customer service. Here’s to hoping.