I have a production server running on Plesk and a few PHP-based sites that have started to behave unpredictably. Pages occasionally fail to load, cron jobs hang, and log files point to nothing conclusive. I need someone with deep, senior-level experience in both Plesk administration and PHP debugging to get to the bottom of it quickly. Here is what I am facing right now: the control panel itself reports no critical alerts, yet the sites go offline at random times. The problems look equal parts server-side and application-level, so I want one person who can read both the Plesk service stack (Apache/Nginx, MariaDB, mail services, etc.) and the PHP codebase to pinpoint the root causes and apply fixes—not just temporary work-arounds. Deliverables I expect • A clear diagnosis of each server or hosting issue you uncover and how you confirmed it. • Fixes applied or documented for the PHP application issues that trigger the unexpected behaviour. • A short report outlining the steps you took inside Plesk, any config changes, and any code edits or patches so I can replicate them later. • Recommended preventive measures (monitoring tweaks, version upgrades, security hardening) so the same symptoms don’t resurface. You will have SSH and Plesk admin credentials on a dedicated staging snapshot first, then production once we’re confident the problems are resolved. Please let me know your relevant experience with Plesk versions 18.x and modern PHP (7.4-8.2) along with an estimated turnaround time.