Bots AFK'ing

I know this isn't your biggest concern Riot, but this seems to be happening fairly consistently so I thought I'd bring it up. In my experience this only happens in intermediate bot games, but in almost every game I've played over the last few days, there's a bot that just sits in the fountain all game. It's completely random who it is, but in my experience it's usually one of the top laners that does it (in my most recent game it was Sion, btw). Sometimes towards the middle/end of the game they come back, but more often than not they don't. Also we had no afk's on our team, so it has nothing to do with that.