FYI: this happens to me anytime the WiiM player's "Preferred DNS Server" setting (in Settings / Network Status) gets set to "Off". And that can happen, as I understand it, if there's a network problem with my router, or ISP, etc. WiiM's software attempts to recover by disabling that option, at least for a while, but that creates that issue with Pandora. You might check that setting if you lose access to Pandora in the future.