Positive reinforcement is a technique used to encourage children to behave as you would prefer them to - this tells you about it: Pulmicort - FamilyEducation.com
To be in a loop means you are repeating a series of actions/an action over and over to no purpose. You are not progressing.
These parents have clearly not succeeded in changing the child's behaviour despite have used positive reinforcement methods over and over.
- For Teachers