Speed Control Springs problems of the 2009 Chevrolet Malibu

My rear passenger door lock disengaged from the automatic locks and can only be opened from the inside. (spring 2016) my traction control is periodically saying that it has malfunctioned but does not always. When the light comes on, I feel a pulse as I'm braking and sometimes if it comes on while I'm driving I'll feel a slight jolt through the accelerator pedal. I also hear a click noise like the pedal may disengage. (late summer 2016) I don't know if it's related but since most things seem electrical, my radio sometimes will not turn off and seems to do what it wants during times when other things are seemingly malfunctioning (I. E. In conjunction with the traction control issue). On several occasions, I have taken the key out of the ignition, opened the door but my radio doesn't turn off. (late summer 2016) on several occasions, I have taken the key out of the ignition, but the car seems to still be running, like idling. I've thought it was the cooling system, but I've never had this happen in the last 22 years I've been driving nor heard it from anyone else I ask. (late summer 2016) I have also been driving, on several occasions, with cruise control engaged and then realize that I'm slowing down only to find the cruise is no longer engaged. The first few times I thought it was me. Now, I rarely use it because it's not consistently reliable. (late summer 2016) while my fuse and bulbs are fine, both of my taillights are not working. (late November, 2016 when someone brought it to my attention).