What does ‘No support from Sonos since I'm not the original owner.’ mean? As far as I’m aware, they answer all calls, whether you’re the original owner or not. What they care about is if you have the device in your possession. If they were concerned about ‘original owner’, they’d definitely need to change their installer support, since the installer, who may be calling in for assistance, isn’t the ‘original owner’.

If I were to guess, I’d suppose this ancient ZP100 has something wrong with it, but without looking at hard data, it’s a guess. 

Older devices like the BRIDGE, built at the same time as the ZP100, are known to have variations in power, enough to cause trouble for a signal, but still enough to power lights on parts, which draw almost nothing, in the grand scheme of things.

Were I you, I would submit a system diagnostic, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

However, I wouldn’t hold out a lot of hope. You may have purchased the proverbial pig in the poke. And if the upgrade credit for that device has already been used, you may not have any attractive recourse. 

Bruce, thanks for the guidance. I will definitely take your recommended path as a start.

The credit has been recognized by the previous owner. He was very transparent about it and also that one of the units was causing issues.

Given the age of the unit, it may be past rehabilitation, I fear. In technology terms, ancient tech. But hopefully, I’m wrong about that, and it will end up fine!