I solved the issue by removing the AAAA register for all my sites.
It seems that the IPV6 + SSL wasn't well configured, and I suppose that mobile over 3G/4G uses IPV6 instead of IPV4, I don't know exactly.
Anyway, removing AAAA register solved the problem, even if it is not an optimal solution.
I also improved my SSL grade from B to A by following this > https://easyengine.io/tutorials/nginx/diffie-hellman-logjam-attack-fix/ which is similar to what you propose, thanks!