Ive setup a system with the following spec :

Audio : 3x Sonos Connect, Sonance DSP 8-130 Amp, 3x zones of Sonance IS4s

Network : 4x Ubiquity UAP access points, Netgear POE Smart Switch, Draytek 2862 Router

Cloud streaming services eg. Spotify, Apple Music etc are working fine through the system, but we are having an issue with playing music "locally" from an iPhone / iPad, eg. using the iPhones / iPads onboard iTunes library which i beleive shows up in the Sonos dashboard as the "on device" libary, the first few songs play fine until, but after 5 - 10 minutes the connection drops out. Ive noticed that if i keep using the iPhone / iPad while the music is playing it seems to work fine, but when the device goes to sleep the music will stop soon after.

Has anyone else come across this before, is it a known issue and is there a way round it ?