I'm relatively new here and learning a lot! And having fun, too. So, a little knowledge is a dangerous thing.
I bought a sourdough starter from King Arthur Flour several months ago and have maintained it according to their directions. Of course, the more I learn about sourdough, the more complicated I think it must be (LOL). So using the instructions from Mike Avery's sourdoughhome.com for reviving a starter - http://www.sourdoughhome.com/revivingastarter.html  - I have been feeding twice a day and now, on the third day, the starter has hooch in just 8 hours since the last feeding. It hasn't been doubling, either.
The KA directions have one feed it and let it sit out until it is bubbly and then put it back into the fridge. It has been working okay, but not much sour flavor and sometimes I cheat and add a little yeast because it does't have enough ooomph.
Any thoughts about what I may be doing wrong, or how to correct it? I appreciate any help you can give me.