Fix Random WordPress Crashes

My WordPress site has started going down without warning. The crashes happen randomly and I already suspect plugin conflicts are part of the problem, but I need a clear diagnosis and a solid fix.

Here’s what I know so far
• The site crashes randomly rather than during updates or traffic spikes.
• Both core and third-party plugins may be clashing, yet I’m not certain which ones.
• I’m unsure whether any recent theme or plugin changes triggered the issue.

I’m looking for someone who can:
1. Reproduce the crashes, comb through error logs, and isolate the exact conflict.
2. Patch or re-configure the offending code, plugin, or setting without breaking existing functionality.
3. Provide a short report of what you found and the steps you took so I can avoid a repeat.

Please be comfortable using standard debugging tools (WP_DEBUG, Query Monitor, server logs) and, if needed, staging the site so live traffic stays untouched. Once the fixes are in place, I’d like a final round of testing to confirm stability before we push everything to production.