Why is socket disconnecting intermittently? Was working fine until recently

I’m using SurrealDB js with SvelteKit and I’m getting this error intermittently:

Uncaught Exception: TypeError: fetch failed
    at node:internal/deps/undici/undici:12345:11
    at async HttpEngine.rpc (file:///D:/CODE/App_V2/node_modules/.pnpm/surrealdb.js@1.0.0-beta.9/node_modules/surrealdb.js/esm/library/engine.js:263:21)
    at async Surreal.ping (file:///D:/CODE/App_V2/node_modules/.pnpm/surrealdb.js@1.0.0-beta.9/node_modules/surrealdb.js/esm/surreal.js:133:27) {
  cause: SocketError: other side closed
      at TLSSocket.onSocketEnd (node:internal/deps/undici/undici:8903:26)
      at TLSSocket.emit (node:events:530:35)
      at endReadableNT (node:internal/streams/readable:1696:12)
      at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
    code: 'UND_ERR_SOCKET',
    socket: {
      localAddress: '',
      localPort: 58122,
      remoteAddress: '',
      remotePort: 443,
      remoteFamily: 'IPv4',
      timeout: undefined,
      bytesWritten: 1946,
      bytesRead: 1023

Anyone know why?
My SurrealDB database is running on fly.io and is connecting/query-able when working but now and then I get this error. Has something changed recently on fly.io? This was working with no such issue earlier…

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