Three starters died in a row - need help.
My third attempt to start a started just ended as the two previos ones - in less than 24 hours my starters acquired extremely strong acetone smell. First, i've tried to make Nancy Silverton grape starter. Then i've tried pineapple juice receipe. The last was this one - http://www.thefreshloaf.com/node/10251/starting-starter-sourdough-101-tutorial
The chain of events is more or less the same - i reach the stage when the recipe says the starter is ready, then i refresh it, wait for 24 hours, take a batch to make a bread. And then the started starts to smell acetone in next 20-24 hours. Obviously, i'm doing something wrong, but i cannot figure out what, because i always follow the reciepe.