1994 Volvo 850 Engine stopping sometimes while on the road

Engine Mechanical problem
1994 Volvo 850 Front Wheel Drive Automatic 230000 miles

Hi, the engine of my Volvo 850 turbo 1994 stops while on the road. I just have to restart it and everything is doing well. It can happen once or twice a day or only once a month...

What is your advice?

Thanks