Radio/tape Cd Player problems of the 2005 Toyota Sequoia

The plastic latch on the rear door of our 2005 Sequoia broke in November 2011. We had it replaced at the dealer for a cost of $300. Fourteen (14) months later, the plastic handle has broken again. This car has only 75000 miles and has been garage kept its entire life. The dealer offered a discount on the labor but nothing else. The mechanism to adjust the side view mirrors was adjusted several times during warranty but has never worked properly. The radio changes stations at a whim and the dvd player quit working right after the warranty expired. The driver side sun visor has an extremely sharp end that must be hammered back periodically. And, the front and rear wheel bearings had to be replaced at 75000 miles.