I'm not a bot or anything (actually I just checked and my user ID is under 30.000, holy shit), but whenever I try Auto Bet for the second or third time on a given day (hours apart), things like these happen:

It doesn't matter if I choose Hi, Lo, Alternate... what is the deal with that? I mean, I do this because I don't really like the Manual Bet, so I try to speed things up a bit (Auto Bet with higher base bet, change odds on lose, increase bet on lose), but I ended up being treated like a bot, I guess... and I don't even play a lot of rolls on Auto Bet, usually I stop after 30 or something
You are not being treated like a bot you are just losing a few bets. If you were a bot I would be blocking you from free plays or deleting your account.
On a 2.5x multiplier it is quite normal to get streaks of over 30. You can verify your rolls and prove to yourself that they are fair.