For some reason my stereo turns off and on randomly. When it does that I can't hear the tick of the car's left and right signal. The engine light is also on. When I got it checked I was told that the catalytic converter was partially clogged but my dealer told me that was replaced with a new one before I financed it. Could it have to do with the electrical system? I already spent too much trying to get this issue resolved. The car is at 67XXX miles. Anyone knows what could be wrong?