I don`t know what has happened. I was driving really well until recently then, all of a sudden, I started hitting the ball in a big, weak, high loop to the left. I have stopped using the driver in the meantime if there are golfers on the fairway to the left of me - I just don`t trust myself any more. I have tried to figure it out but just can`t. I seem to be getting in under the ball and then rotating right through. The result is horrible! I have experimented with tee height, ball position etc but all to no avail. Can anyone offer me advice / drills please? Thanks.