Need help diagnosing a few things

[xX2pro4uXx20]

I'm basically restoring my 1997 porsche boxster. I've done a few things but there's a couple things that I'm not sure on.

1 is whenever driving the car, the back end will move to the left or it even happens whenever I go over unevenness in the roads. It happens whenever either wheel goes over a bump. If you have any questions to help figure out what it is before I buy parts then let me know.

The second thing is on the highway, the ABS and the traction control lights come on and the radio doesn't work but whenever I turn the car off and start it up again, the lights turn off.