If you get logged out from cPanel and get an error The IP has changed, then it is possible that you have a dynamic IP address.
Of course, you may contact your Internet Service Provider and get a static IP address. Otherwise, follow the steps below to install cPanel proxy to your account.
1. Navigate to Subdomains menu in cPanel and create a subdomain cpanel.
To access Webmail and WHM (if you are a Reseller), create corresponding subdomains, too:
2. Download cPanel Proxy script to your computer.
3. Go to File Manager, click on recently created public_html/cpanel (public_html/webmail, public_html/whm), click Upload and select the file on your computer
4. Go back to the folder and click on the Extract button. From now on, use http://cpanel.yourdomain.com, http://webmail.yourdomain.com and http://whm.yourdomain.com to access the control panels areas.