We've had near zero off and on since October, and several weeks of consistently below zero weather here where the car is parked outside for 9 hours during the workday, and there have been no symptoms like that.

I've had one case where the car was very cold and the idle speed seemed to make "surges" to 2800 rpm every 10 seconds or so, and it felt that maybe it was being felt in the brake pedal.....but not much. It went away after about 5 minutes of driving. Other than that, completely normal operation. As expected, when the battery is cold there isn't much in the way of electric assist or charging until it warms up, but no lights and no odd symptoms.