Fixes to a PHP/AJAX/JS script

I am developing a site that shortens URLs and shows interstitial adverts before visitors see the URL that has been shortened. Link publishers earn money based on how many views they send to the links. The problem with my script is simply. The users have a dashboard complete with graph and tabled data extracted from a MySQL database. After around 5 days of earning, something breaks site-wide and none of the graphs display anymore, or the tabled data, it just shows "Loading..." (See attached files) Secondly, I have a feature that allows advertisers (who pay for advertising in the interstitial space) to set a 'daily budget' for campaigns they create. This feature currently does not work and when a daily budget is set, the campaign does not run at all. This will need fixing also. All in all, this is a relatively simply job. Budget reflects this. Note: I am looking for somebody to fix this problem. If a good job is done, I may have more work available. I will give preference to a worker who may be looking for repeat work after this job.