Hey,
I can confirm, for the stores which use ethernet that it is patched to the router itself through the comms rack. This issue also persists irregardless of network quality as far as I can tell, for example, the same issue persists at retail stores inside busy shopping centres and in smaller, walking streets.
Supposedly, the issue has to do with power. We hang most of the speakers on the wall mounts (bar the ethernet provided few), and they are prone to breaking and providing very inconsistent power, sometimes un-powering entirely for hours if misplaced. I’m looking into different wall mount options now and hopefully that can save the issue.
The airplay buffering shortcomings is a good thing to know. Hopefully the issue isn’t that, as I am unsure of other methods of playing music (maybe USB-C or line in, but some of our levels just cannot be wired together reasonably).
The reason we use our own VLAN is just for ease of control with access points, as when purchased the speakers did not function well with the wifi service we use.
Thanks for the advice, I shall look into more stable internet connections.