Sveltekit 在部署到 Vercel 时失去与 MongoDB 的连接

我最近在 svelte.config.js 中使用

@sveltejs/adapter-vercel

import adapter from '@sveltejs/adapter-vercel';

const config = {
    kit: {
        adapter: adapter(),
    },
};

作为数据库，我使用 MongoDB（托管在 Atlas 免费集群上）。问题是有时（看似随机）无法再访问数据库并抛出以下错误：

MongoTopologyClosedError: Topology is closed
    at processWaitQueue (/var/task/node_modules/mongodb/lib/sdam/topology.js:513:46)
    at Topology.selectServer (/var/task/node_modules/mongodb/lib/sdam/topology.js:282:9)
    at Topology.<anonymous> (/var/task/node_modules/mongodb/lib/sdam/topology.js:41:94)
    at node:internal/util:375:7
    at new Promise (<anonymous>)
    at Topology.selectServerAsync (node:internal/util:361:12)
    at executeOperationAsync (/var/task/node_modules/mongodb/lib/operations/execute_operation.js:74:35)
    at /var/task/node_modules/mongodb/lib/operations/execute_operation.js:12:45
    at maybeCallback (/var/task/node_modules/mongodb/lib/utils.js:263:21)
    at executeOperation (/var/task/node_modules/mongodb/lib/operations/execute_operation.js:12:38)

在做了一些研究之后，我不清楚到底是什么导致了这个错误。这就是我连接到数据库的方式：

import { MongoClient } from 'mongodb';

const client = new MongoClient(PRIVATE_DB_CONNECTION_STRING);
const db = client.db();

export async function connectToDatabase() {
    try {
        await client.connect();
        console.log('Connected to mongodb');
    } catch (error) {
        console.log(error);
    }
}

export const myCollection = db.collection('randomCollection');

connectToDatabase()

hooks.server.ts