Also seeing this, I believe in my case it happens when the round ends. I have some classes that loop the entire round and access another Verse device. Then when round ends garbage collection removes the devices in a random order causing the loop to try to access a device that no longer exists. I’m not sure if it effects the gameplay or not as I have not had the errors happen to me while playing. However in my case a short term fix was to gracefully end the loops using an IsRunning logic and calling to the devices setting IsRunning to false to break from the loops before ending the round.