Most website problems stay quiet. They fail without a sound, and you hear about it from a customer weeks later. Five things worth checking today, about ten minutes of work.
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Send a message through your own contact form and check that it lands in the inbox. Forms break silently whenever a mail provider, a domain setting or a plugin changes, and the page still shows the visitor a cheerful thank-you.
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Check when your SSL certificate and your domain renew. Both expire on a calendar date, not on a warning, and an expired certificate greets your customers with a browser security screen instead of your homepage.
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Do a real signup or a small order and watch for the confirmation email. Receipts and password resets are the messages people need most, and they are the first to quietly start landing in spam after any change to how mail is sent.
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Open the site on a phone using mobile data, not the office wifi. That is how most people arrive, and heavy images that feel instant on a fast connection are what loses visitors on a slow one.
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Ask who finds out first when the site goes down. If the honest answer is that a customer tells you, that is the real gap, and the first four items are just symptoms of it.
None of this needs a developer. It needs someone whose job it is to know the answer.
You probably already suspect which of the five is out of date on your site.