@LeMirage, you may already have tried this, but the typical response for certain “other” wireless music systems (coughSonosSneeze) is to assign static IP addresses in your Wi-Fi router for each and every system component, and move its DHCP base address higher than any of them. (And reboot everything afterward, plus make sure you have not assigned the same static IP addresses to anything else, of course.)
This absolutely should not be necessary — but consumer residential router firmware is sometimes as buggy as B&O’s. Especially across single devices being unplugged or the internet connectivity going down temporarily, this kind of thing “just happens”. It’s a pain, and you don’t know if it did any good until days later, but it’s worth a try.