Given the nature of the problem, a fault code should have been logged somewhere.
Could be a steering angle sensor fault, or possibly even an issue with the rack itself.
2008 was when they started putting the steering angle sensor in the rack itself. Before that, it was on the steering coloumn behind the steering wheel.
I'd be taking it to a dealer for further diagnosis.
Another thing it could be is poor contact on the high amperage fuses on the front of the fuse/relay box in the engine bay. That'll usually throw a lot of low voltage codes.
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