1- In most cases this problem is due to a dirty or scratched disc. Try cleaning the disc with soap and water. Use neutral soap and a soft cloth, working with the cloth from the centre of the disc towards its outer edge. Do not press too hard on the disc and dry it with another cloth before inserting it in the player.
This process will eliminate dirt and fingerprints, but will not solve marks or scratches on the disc. If this is the case try another disc.
2- Pause or Image Freezing.
The pause or image freezing may be due to a groove on the disc. Try another disc and if the problem persists the optics may have a fault so contact your local dealer.