One problem related to engine stall has been reported for the 2006 Mercedes Benz R350. The most recently reported issues are listed below.
Wiring from engine harness to fuel pump burnt on freeway , engine stalled and shut down, could not start back up in middle of i5 freeway. Repairs are amounting to $4000. Could have burnt entire vehicle and after reading numerous complaints with exact same problem something needs to be done.