You may have received a warning or a limitation on your SSL grade due to weak DH key exchange. This is not a cipher issue, but can be easily corrected by adding a 2048 bit group to your PEM file.
Create a new file by running:
# openssl dhparam -out dhparams.pem 2048
Then take the contents of dhparams.pem and add them to the bottom of your Snapt .pem certificate file.