What Jase & John say. Last humans to touch mine was wheel alignment mob. Either way after market suspension parts need to be carefully checked for any irregularities as routine part of servicing imho, Especially lhs., which gets hammered even in a straight line anyway, if you are on shite road surfaces or driving hard more often than not. Which means quite a few of us I reckon.
I would have found my problem before it let go if I had paid more attention as it is a gradual thing in development of loosening bolt bits, clunks & rubbing noises. Mine was scheduled for inspection/alignment with a suspension mob when it let go. Noises are not to be ignored, they don't care about appointments lol.
Also look for cracks on standard parts if you upgrade swaybars/springs/shocks. (Most of us yeh?)
I have Whiteline solid adjustable swaybars plus Bilstein/Eibach shocks/spring setup. All that extra resistance to movement during cornering is great but was still transferred through bracket pictured below ~ on my bus. Maybe there is an upgraded bracket on the market, dunno.
Found this crack during replacement job after fail on highway. This is the mounting bracket for one end (LHS) of front swaybar drop link to strut. Crack had been there for some time, was already previous looking & rusty, new damage caused by strut dropping on to front axle was nice & shiny, (resting on swaybar bracket) & staying in place thank f^&k, until car pulled up. We were lucky.
Cheers, GW