Even though SONOS has closed the original topic with this name it does not mean that the problem is solved yet. Trying to measure my living room with an iPhone 8Plus (everything in the latest version) causes a freeze. But I do not wonder any more. Every request to the hotline I made before went to nothing, so I assume this problem will never be solved as every other problem users have with their products.
On X-Mas I will do my self a favour and swith to YAMAHA.