I have same issue. Only workaround is to reboot Canvas but this helps just for a short period of time and then this issue is back. It seems that Canvas freeze, so I don't think that it is only related to wifi or HomeKit. Try to disable scene sync, it make Canvas little more reliable too.
Yeah, on iOS even on latest firmware beta for Canvas I still have issues with no response or network errors. Resetting Canvas dosen't change too much and rebooting helps just for short period of time. I think this is right now the biggest and most irritating issue with Canvas. It works more reliable with static scenes but this is not the solution.
Same here, I had three kits, all three randomly show up as “not available” in HomeKit across all my iOS devices and automations keep failing. When switching to the Nanoleaf app I get a general communication error. I contacted support but just got the usual check your WiFi, reset, etc.
I have a dedicated 2.4GHz WiFi running for my IOT devices, everything like the Aurora, my vacuum robots, etc. work totally reliable. Just the canvas is giving me a hard time. Even the latest firmware 1.2 didn’t solve it.