Server to server oauth - Invalid access token

We have upgraded our API request from JWT to Server to Server Oauth and since then when ever there is high concurrency all the API requests started throwing “Invalid Access Token” error. We have a large amount of request going from multiple server instances for creating/updating meetings and retrieving recordings and participants.

For retrieving the token we are using following API:

https://zoom.us/oauth/token?grant_type=account_credentials&account_id={accountId}

Please help us resolve the issue.