I've never had a strike with all 3 kids (I probably just jinxed myself w? my 11 mo old LOL!) Here are some common reasons, maybe you can figure out what has been causing them so it stops happening? Good luck!
You've been under stress (such as having extra company, traveling, moving, dealing with a family crisis).
Your baby has an illness or injury that makes nursing uncomfortable (an ear infection, a stuffy nose, thrush, a cut in the mouth).
Your baby has sore gums from teething.
You've recently changed your nursing patterns (started a new job, left the baby with a sitter more than usual, put off nursing because of being busy, etc.).
Sleep training, or letting baby cry unattended
You reacted strongly when your baby bit you, and the baby was frightened.
Using a bottle
at 9:46 PM on Jun. 14, 2010