NOTICE WHEN ONE PARENT OBSTRUCTS YOUR RIGHT TO CUSTODY OF YOUR CHILDREN.  Get Ready for Battle.  Get a lawyer.

. . . .the offending parent may be doing more than just trying to be a thorn in your side. . . . they might be planning to shift from acting passive-aggressively to outright aggressively.
She explains, “When the violating parent creates a pattern of conduct (Habitual Violation of the Agreement) I advise clients to “get ready for battle”. This is oftentimes an indication that the violating parent is building a case to make a change of the custodial arrangement.