Sudden Website Freezing Issue

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I currently manage a client's website which today reached 400+ visits and then started facing sudden freezing issue. No new plugins were added in the past month. Tried going back to the old theme as well, didn't work. The only place the website is working fine is when I'm in the *Customer* page of the theme. While customizing, I see no freeze at all but the moment I go to the public page, it goes back to freezing for 20-30 seconds. Could anyone please assist with the troubleshooting? I tried different browsers, devices, incognito mode, other theme everything.

The website domain is

Thank you. Waiting for any assistance.