Dear sir,
I read your project description.
I am sure I can do this for you, in a timely manner.
Please take a look at my profile, here is my skillset as well as more informations about me.
https://www.freelancer.com/u/thms00.html
This will need a bunch of debugging, tests & error logs reading.
Are you sure it's your webserver and not your website ?
I have done this many time, there are browser extensions that will help too, to see if it's the website or your PHP/HTML/JS.
Could also be your hosting provider, did your check bandwidth ?
Anyway, I'm offering you a small bid so I hope to be awarded !
Please come and have a PM chat with me, I am kind and helpful.
Willing to start right-away!
Regards,