I had that problem surface in a similar manner...stall out when driving, making sharp turns (especially with the A/C on). Eventually, I had hot start problems added to the mix.
Thought it was bad gas until I joined the forum and was enlightened.
Replacing the OVP relay cured ALL of the problems.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car