In case you missed it Google has a serious problem with Symantec SSL certificates and is removing their Greenbar status in Chrome as well as rolling out "not trusted" notices for sites using mis-issued certs by Symantec.

https://techcrunch.com/2017/03/27/google-is-fighting-with-symantec-over-encrypting-the-internet/

In response to the problems Namecheap is offering free replacement of the certificates - you get whatever time is left on your Symantec SSL certificate on a Comodo SSL for free.

https://www.namecheap.com/security/symantec-ssl-certificate-free-replacement.aspx

Symantec's certs were serious hacked recently which is why this happened.

Google announced that its Chrome web browser will not trust an SSL certificate from Symantec for more than 279 days.