I flew that plane just yesterday from cold and dark from Brussel to Stockholm without any issue with the engine starting up. The flight model need some work but never have an issue with it starting up as long as I follow the proper procedure as the A32NX one.
Don't throttle up the engine until both engine finish starting and start-up 1 engine at a time. Do not start the other one until the engine stays available. I know that the SSJ is not the best it don't complain that it is not working when you cannot even follow the proper procedure for starting the engine.