I am experiencing that whenever my ReactsJS frontend makes a call my Strapi server stops responding and we need to restart the Strapi service.
What host do you use?
I experienced a same issue.
I am hosting it on Railway for development.
CRON jobs are still running, no alarming logs, but I cannot access to the admin page, and the server don’t respond.
I had to restart the server.
I hope this is just my hoster problem, and not a recurrent issue with Strapi v4 !!!?