Sub domain redirects to suspendeddomain.org

I have added a CNAME record form blog.roshsoft.com to ghs.google.com as instructed by Google in order to add a 3rd party domain for my blog. Sometimes the link suddenly redirects to suspendeddomain.org.

Why is that?

It probably happens your computer still thinks InfinityFree is hosting the subdomain. Just wait a few days for the DNS changes to start working everywhere.