All summer long, when I fed my starter I set it up in the windowsill.  That was just fine until the sun got lower on the horizon.  A month or so ago, I fed it in the evening & forgot to keep it away from the window.  It was quite warm when I found it the next afternoon.  It's been through several feedings, some white and some whole wheat. While it rises fairly well it still smells like acetone.  I think it's time to toss this one and start another at a later date.