Was on my way to work this a.m. And doing 65 in 4 wheel. I abruptly lost all power to the wheels as if it shifted to n. Coasted to shoulder, put in 2 and in drive and away I went. Same thing happened and I pulled over and got her going again. When I got to work I tried to put it into 4 again but the bottem two buttons only blink. I have a 3 button. Any ideas? Thanks.