KSFO Anomaly

I don't know whether anyone's encountered this, but a weird thing happened to me in FS2002.I was parked on the northeast end of San Francisco International, right between runway 28R and 19R. I am using the default King Air.Ground tells me to taxi to runway 28R via CHARLIE. As soon as I get on Charlie, my plane jumps (as if there was a bump on the taxiway). I thought nothing of it.A little after I cross 19L, I hit another bump, the surrounding scenery "disappears" and I lose power. I restart the engines then the scenery comes back.Any idea why it would do this?