I have 13 SONOS units, including ZP100’s and ZP80’s that work perfectly. Today, SONOS sent an email announcing that 10 of the units will no longer get software updates as of May 2020. So, if any music service, MS Windows, or Apple makes a security change after May 2020 that the existing software doesn’t agree with, then my system will stop operating. The replacement cost of these 10 units is $4,650 and even with 30% offered for trade-ins, my outlay to keep my system operating will be $3,255. SONOS’s management should keep a software update track for “legacy” equipment in order for existing functionality to remain working.