Cron job Elastic Beanstalk issue

Here is my Python code for two cron jobs:

 scheduler.add_job(
        func=process_users_main,
        trigger="cron",
        minute="0/30"
    )
    scheduler.add_job(
        func=func2,
        trigger="cron",
        hour="0/3",
        minute=15
    )

I am currently hosting this on AWS Elastic Beanstalk.

This works fine for about 24hrs but then the system just seems to crash with this error: Execution of job "main (trigger: cron[minute='0/30'], next run at: 2023-08-10 17:30:00 UTC)" skipped: maximum number of running instances reached (1)

For reference, these cron jobs are not very computationally heavy (are quite fast/easy to run). What I do not understand is why it works for about 24hrs before it breaks.

Should I consider using AWS lambda for these cron jobs instead?

Here is my configuration for the scaling of the Elastic Beanstalk instances...