We have been trying unsuccessfully to set the blog to use a subdomain. It is currently set up using a custom domain, but we wish to change it to a subdomain. This subdomain option has been purchased additionally, and the CNAME record is in place against the blog name ngrainblog.wordpress.com (per the documentation). The CNAME has a short TTL, I found that immediately after the setting is made, the subdomain works to access the site.. but after some time, it stops working... so we have had to flip it on, and then revert a number of times, so this is quite frustrating. With a short TTL (5 minutes) there should not be much downtime during the transition, however when it stops working, it is not able to find the site at all.
The blog I need help with is ngrainblog.com.