I was driving on the motorway, it was happily cruisng along at 70mph but when I floored the accelerator to overtake it failed to rev pass 3K, didn't feel the turbo kick in either and the speed barely increased. I pulled over and at slower speeds the wheels felt really heavy as if I had a punctue or the handbrake was one. I stopped and checked but neither was the case. I restarted the engine and all was fine. Since done 300 miles and symptom never reappered and no warnings on instrument panel. Any explanation on the issue?