If you are seeing issues with ball lock or missed shots please see below:
In some extreme instances, the color of the mat may be reflective or conflict with the device's ability to see the ball. This is because when light is reflected off of the mat it causes the camera's gathered image to be whitewashed and confuse the hitting surface with the ball itself. If you believe this to be the cause of your problem please remove the mat and test to see if you can obtain a ball lock.
If you have continued issues please be sure to review the other troubleshooting guides that appear relevant to the issue you are encountering.