I've had a few of the *arrs running in Docker on Unraid without issue for several months now. Yesterday afternoon I was ripping a bunch of CDs that my wife had picked up, and midway through I noticed that Lidarr was not allowing to add new artists or albums that were not already populated in my library. Manually searching for anything results in the attached screencap and the log entries below:

[Warn] HttpClient: HTTP Error - Res: HTTP/2.0 [GET] https://api.lidarr.audio/api/v0.4/search?type=all&query=billie+holiday: 500.InternalServerError (33 bytes) {"error":"Internal server error"}

[Warn] LidarrErrorPipeline: NzbDrone.Core.MetadataSource.SkyHook.SkyHookException: Search for 'billie holiday' failed. Unable to communicate with LidarrAPI. [v2.11.2.4629] NzbDrone.Core.MetadataSource.SkyHook.SkyHookException: Search for 'billie holiday' failed. Unable to communicate with LidarrAPI.

I've done a little searching, and I gather this is a result of my Lidarr instance not being able to communicate with a metadata server, but the troubleshooting advice seems to be focused on new installs with network configuration problems. I had made no configuration changes during the ~20 minutes since my last successful search (nor really in the last couple weeks), and all my other *arr apps are working perfectly fine, so I'm kind of at a loss. I've tried restarting and updating the container, but no dice, so here I am...

Ideas/suggestions?