Jeep shuts off

My jeep will sometimes shut off while coming to a stop at
a red light or while I'm stopped at a red light it shuts off. It
also shuts off sometimes when I switch between reverse
and drive. And when I turn the steering wheel after I shift
into drive or reverse, it shuts off. It seems that turning the
wheel makes it lose power. Before it shuts off, it starts
shaking like it's completely losing power and then shuts
off. I have to put it in park, then shut it off, and turn it back
on. It always starts back up every time. It just makes
people mad that are behind me because I'm not moving
when the light turns green. And it seems to be getting
worse. This is happening a lot more frequently lately.