My AC is turning on and off sporadically--mostly staying off now.

What is your question?

Oddly, the rear vents still work (although the air is not cold.) I recently replaced the blower motor resistor because it would only work on HIGH which solved that problem. I don't know if they are related or not. Again, All of a sudden my AC (in the front) verses the back is turning off. Sometimes it will start to work again--it's tempermental. Any idea what it could be? Is it related to my other problem?