Spotify Connect: WiiM randomly appears under “On other networks” (iPhone + Mac/PC) — only fixed by “Log out of this device”

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Hi all — I’m seeing a really odd Spotify Connect behavior with my WiiM and I’m trying to confirm if it’s a known bug (Spotify vs WiiM) or something about my network.

Issue (repeatable):

• I am connected to WiiM in Spotify and basically listening to music. Then switch output back to “This iPhone” (or another local device).
• After that, Spotify shows the WiiM under “On other networks”, even though it’s on the same Wi-Fi as the phone/laptop.
• If I tap the WiiM (while it’s under “On other networks”) and choose “Log out of this device”, it immediately starts showing normally again under my network — until it flips again later.
• It can also flip to “other networks” after I am not using Spotify with WiiM for a day or so.
• Same behavior happens on laptop Spotify too.

What I already tried:

• Reinstalled Spotify, cleared cache, logged out/in
• Restarted iPhone / laptop / WiiM multiple times
• Router factory reset + new SSID + new passwords
• Tried 5 GHz only, tried disabling 2.4 GHz (no improvement)
• Mesh OFF, multicast ON
• WPA2-PSK (AES) only (no WPA3 mixed mode)
• Disabled IPv6 on WiiM (also tested toggling it)
• Spotify has Local Network permission enabled on iOS
• Cellular data disabled for Spotify/WiiM (tested)

Notes:

• No other Spotify Connect device behaves like this (PS5/MacBook/etc. are stable).
• WiiM is on latest firmware.

Questions:

1. Has anyone seen a WiiM specifically get “misclassified” as On other networks like this?
2. Any known fix/settings (Spotify/WiiM/router) to keep it always detected as local?
3. If you’ve solved it, what was the exact change?

Thanks!