Dear Requester,
Do we have our serveres hosted, and do we operating also our web environments on nginx, so I see so we have the required expereiences to solve your environment issues . I would propoes a short system check, and take the corrective actions as soon as possible, to avoid more traffic loss.
I have more than 20 years expereiences to plan and operate enterprise systems with Unix/linux OS-es.
Thanks for reading my bid, and good luck with yopur systems