Thank you for the detailed guidance. I’ve already started enabling WP_DEBUG and WP_DEBUG_LOG to capture more information because the issue has become very inconsistent and difficult to reproduce reliably. I’ll check the wp-content/debug.log file carefully after the next error appears and also contact my hosting provider to see if there are any server-level logs related to the recurring 500/503 responses or resource limitations. I also tested disabling plugins and temporarily switching to a default Twenty* theme as suggested. What makes this situation confusing is that the site sometimes works normally for hours before the problems suddenly return again, which makes it harder to isolate a single plugin or theme component. I’m beginning to suspect there may be a deeper conflict involving caching, minification, or server-side optimization rules rather than just one broken plugin. I’ll continue testing step by step and compare the logs to see if a consistent pattern appears.
