I have 20 years of professional networking and software experience- so spare me the “networking issues” bull. You owe it to your customers to not make such a terrible piece of garbage. I spent $500+ on different speakers 3 Fathers Days ago. We have tried numerous times, even upgraded our internet service. 
None of it works without headache and frustration. It’s not you, it’s not your network’s to it’s Sonos! 
Next time- I’m spending 1/3 of the price on an Amazon Bluetooth speaker that I could replace 5 times and still not spend what I spent on the Sonos. 
Hint to the product team (if anyone actually reads these)…. Your customers DONT WANT A Fristrating product or app. They want simple and easy. So just take your dumb non working app and scrap it and just create Bluetooth connectivity only. It will probably save your company thousands of hours on support calls. Regretting this purchase more than anything I’ve bought in 15 years.