The deck mechanism of the unit could be dirty. Carry out the cleaning procedure by first, slightly moisten a cotton swab with alcohol or head cleaning fluid, then press PLAY to clean the rubber pressure rollers with the swab. After that press PAUSE and clean capstan and the head. Cleaning tape may also be used for Head cleaning.
There may be machinery or electrical appliances which produce strong magnetic field operating near the set hence interference result.Change the player's position or connections.