On December 26, 2017 at 07:15, musictoo said...
Same happened with us. Working system for over a year and then a broadcast storm. In this case when I first connected to the network I got a 10.10.0.x subnet. The router there is 192.168.1.x. We powered down all Sonos devices and turned off radios where we could.
This suggests that there is a second DHCP server on the network. Or, you forgot that you had fixed the address of your computer. This happens to me occasionally after I had to use a fixed address for my computer while I configured something on my last job.
