I know squat about Milanos - but it does sound like a loose ground or wire. Are there any important electrical grounds on the right hand side of the engine bay? I'd think with pulling a hard right the G-forces will want to pull things to the left, perhaps something on that side of car is pulling away from it's ground or lifting into contact with another wire or ground and causing the shutdown.Thats odd, it might be a loose ground or something hard to trace, also a battery wire? AFM flapper? maybe the spring is worn. Sounds like you have quite the hunt ahead of you. Good Luck
On a brighter note - at least it's fairly consistant usually, they're more Mercurial in their habits!