2015 nissan qashqai start stop fault

[Nairn scobie]

I have a 2015 nissan qashqai after about 1 month of having it it has developed this fault, for no reason at all the car throws up a start stop fault and red engine management light comes on at the same time it also gives a chassis control fault, if you accelerate hard this clears the start stop fault but chassis control fault stays on till engine is switched off, have had it to various garages the battery has been replaced and auto electrian tried to reprogramme the car again this worked for a little while, driving tonight the fault happened again I accelerated hard cleared the fault but now the engine management light on the other side has came on anyone any ideas as to my next step