Wordpress Site - Debug

I need an Expert in WordPress Plugins & Scripts . Client Site : [login to view URL] has Developed Script Conflicts . 1: Site Freezes When 1st Time User Registers or Logs In . 2: Wish List : When User tries to add product to wish list , he is required to Register or Log in - After which he can add products to his wish list . The Conflict is that after registering or logging in , if the user is trying to add any product - he is AGAIN Logged out & required to Register / Login - This is a Loop . 3: The Conflict Shows on some Browsers - such as Edge , Friefox & Safari - But Sometimes Does not Show on Chrome . 4: Registration Details : When New User Registers - His Complete Details are Not Updated in WP Users Database & Is not Forwarded to Admin Via Email . At Present Admin Only Receives info on email address and Username - Not Complete details . Site is Hosted on GoDaddy Managed Wordpress Freelancer will need to Provide his Email Address to receive an Admin Invite to be Able to Access Database or need to Register on [login to view URL] We Need this Done in 3 Days . No More than 3 Days .