I think this is starting to make sense.
SO my wife said before this happen that day, she was driving and heard a loud pop. She thought maybe she ran over a nail and it hit the tire. When she got home, the tires looked fine and the tire pressure was normal. Then she used the car again and that's when it happen, the jerking left and right.
Suspension wise - it likely to be one of two things.
The ARB suspension link - could have broken - that links to the anti-roll-bar, so yes with speed you're going to notice excessive play under speed and load, as the point of the link is to provide equal torsion force from the opposite corner at bends.
Secondly - the front coil springs. Again - with age, corrosion or if you've hit a pothole it can break. Normally you'll hear a twang on hard lock to hard lock, plus the car will drop slightly at that corner as they invariably lose a few inches height.
There's nothing that a garage won't be able to undertake that the main stealer would likely charge you double for. There's no electronics on the suspension other than ABS sensors, etc.
If it is the coil-spring, then I'd renew the suspension top mount as a matter of course as the integral bearing tends to seize (could actually be the culprit for the spring friction) and the rubber dust boots, seeing as the suspension has to be disconnected and it can lean out from the wheel arch to fix. More details here:
Keep us posted as to the outcome.
2015 i3 REx, 60ah, solar orange. Reversing camera, leather interior, sunroof, park assist, professional navigation.