Please help 98 740il 65,000 miles the radio is shuting off after about 30 min. of driving time, also the dash turn indicator lights stop working, outside the indicators still work, this is driving me crazy, is dsp amp over heating??? if car is shut down and let sit for 1hr. everything works, ignition switch???? battery is one year old, also is there a way to lock the doors but keep the alarm system off, I have 745 87, 740il 98, both are great on highway, but the nickle and dime problems that bmw engineers don't work out, cruise control that stop working, radio the turn off, speakers that are junk, cup holders why even have,