Auto Tranny Problem

Thanks for the info Jack. Actually, I was talking to my buddy last night and told him the next time it happened, to stop the vehicle as soon as he safely could, turn off the engine, wait a little while, then turn it back on again to see if maybe a sensor, servo, or the computer would reset itself. He is driving this thing on dusty gravel roads most of the time, and I was thinking maybe dust in one or more connections could be causing the problem. on a 22 year old Jeep, wiring connectors and such dry out and allow water and dust to get in there.