Camera lens autofocus malfunction diagnosis and repair is time-consuming and expensive

Professional and enthusiast photographers experience unexplained autofocus seeking/hunting behavior in expensive telephoto lenses (like the Tamron SP 150-600mm), forcing them to troubleshoot across forums, contact manufacturers, or pay for costly repairs. Current solutions require extensive trial-and-error, waiting for support responses, or shipping equipment away during critical shooting seasons, leaving photographers unable to work.