Hi there,
I have a good bit of experience with MySQL, load and the like. It's entirely possible that your server is not crashing directly due to MySQL, but something else entirely, and I'd love to take a bit and help you figure this out.
Understandably, my bid is probably going to take longer than you desire, however, this is just the time allocated to find and fix the problem. In most cases, the time for something like this is < 24 hours, and I can get this done easily enough.
If you have any concerns, please do feel free to view my profile, you'll see a 5 star rating and 100% completion (sans a few stragglers that were paid outside of FL).
I look forward to hearing from you and working with you on this project