My 2000 Volvo S80 tends to cut out when traffic lights

Every day I have to go to my company 4 kms away by my 2000 Volvo S80. But I’m often late , because my 2000 Volvo S80 tends to cut out when traffic lights, then usually succeeds to restart until at least 5 mins, which is very boring.
http://www.bidanswer.com/Questions/QuestionInfo_10282.html