Most free public Lavalink nodes are hosted by hobbyists or students. They might shut down the server to play a game, their internet might go out, or they might simply stop paying for the VPS.
Configure your bot with multiple nodes so it can failover automatically. lavalink hosting free link
You can deploy it using a pre-made Lavalink Docker image directly from GitHub. Most free public Lavalink nodes are hosted by
In your Discord bot's script (whether you use Discord.js with Ermis/Lavacord, or Discord.py with Wavelink), update your node configuration with your new free hosting link: ://onrender.com (Do not include https:// ) their internet might go out