Hi all,
Turns out the secret to stopping my WiiM from running warm in standby is simply teaching it some manners. Mine used to sit there glowing like a guilty toaster even when nothing was playing, because it was constantly whispering sweet nothings not only to the mothership but to every random server it could sniff across the internet, like an excitable dog licking strangers at a bus stop. So I put it on a strict diet, tightened its DNS leash, and now the little fella finally understands what standby actually means. These days it stays cool, quiet and obedient, only waking up to stream Spotify instead of trying to chat up half the cloud. And yes, once in a while I let it out of its cage for a quick OTA firmware update, then it goes straight back in, calm, refreshed and blissfully silent.