Hi RickYeh777,
The attachment is the LIN project with your configuration. I ran this example successfully.
I saw that you are using interrupts. From my point of view, most likely the interrupt priority of LIN is effect to your issue. So, you can re-test with two situations:
Situation 1: you should set up the interrupt priority of LIN as the highest.
Situation 2: disable all of the interrupts different with the LIN interrupt.
Best regards,
Dan