Cannot log in to my account

I've been having this problem for a few months now. One day, I was playing Minecraft and it was working fine. A few hours later when I tried playing Minecraft I found myself logged out of my account on the launcher when I have it set to keep me logged in, and when I tried logging in it returned the error (CertificateException: No name matching authserver.mojang.com found). I tried over and over, day after day, but it never worked. Even today, after months, I still have the same issue.