The court does not monitor parenting plans, therefore without notice from one of the parties, it will not modify a parenting plan. To change the parenting plan, one of the parties needs to file a Petition to Modify the Parenting Plan. So the short answer to your question is no - a court will not, on its own, change a Parenting Plan.

This is a very complicated question - but the short answer is that there must be a major change in the circumstances of the child or the other parent AND the changed parenting plan must be in the child's best interest. If you are making small changes in the plan, the hurdles are a bit lower. However, without agreement of the parents, you do have a challenge in changing the plan. Courts do not like to change parenting plans generally, as stability is important to the child. However, there are lots of exceptions to the rule. Safety and stability of the child are most important.