Web to lead submit form not working sometimes

Web to lead submit form not working sometimes

Sometimes when I submit web to lead form, instead of showing standard Thank you page on my site, it shows ZOHO CRM page.

Once I also got "Login expired. Relogin" page as well.

Has anyone seen this? If I refresh and do it again it works.

Mihir Shukla
Tethys Solutions
http://www.tethyssolutions.com
SMART Automation & Macro Software