2002 Sterling Acterra Lighting problems

When driving with the lights on, after 15 minutes to 1 hour, the tail lights and the box lights went off. The headlights stayed on, when turned off, they would come on again and would stay on for 10 minutes and the tail lights would go off again and the head lights would stay on. The windshield wipers were intermittent and the washer fluid would come on by itself. The electric door locks were intermittent. Several mechanics suggested that the 15 watt fuses would get too hot. The rear transaxle seal leaked. *Sc