I've been having this problem too, but I assume it's just all luck. I started botting for about 8 hours a day, for about 3 days (11:30pm - 7:30pm Pacific Standard Time.) from rank 13 - rank 5. Afterward, I played legitimately until I hit rank 4. (I was using Dre's Mid Ranged Shamen Combo, Settings etc. with silverfish but changed the deck a little bit.) A couple days later, I did the same EXACT thing and dropped from 4 - rank 8... Either I'm am really unlucky, meta changed to shit, or the bot just got stupid.
(Also, this is prob the wrong place to put this, but the bot doesn't know how to play Flametongue totem. It doesn't know that once a minion dies, the one next to it gets the buff.)