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Confluence users can experience that when “Allow using Kerberos for REST calls containing the 'referer' header” option is off, confluence-search-ui-plugin will navigate the browser to login.action if “Allow using Kerberos for REST calls containing the 'referer' header” option is offthe session expires and a call to /rest/api/search returns 401 or 403.
If the option has to be off, a mitigation might be to increase the session expiry timeout:
https://confluence.atlassian.com/confkb/how-to-adjust-the-session-timeout-for-confluence-126910597.html