I have a 2002 Ranger, 4 X 4 with a 4.0 L engine xlt (not fx4). Recently, the four wheel drive engages itself and immediately disengages itself at random times, say 3 times over a five minute period, regardless of speed. If I select 4 high, no cycling takes place and it stays in 4 wheel drive. The only other "ghost in the machine" is that the radio will all of a sudden change channels, or try to load a CD without any input from me. Does anyone have any ideas?

Thanks,

Dan