This is a common problem with mid-late 90's Rangers. Simple solution is
to thoroughly spray the door latches with WD-40 while opening/closing
doors. The switch gets gummed up and does not operate properly.
Dealers are well aware of the problem and unfortunately you may have to
replace the switches.
Yet another $.02 worth from a proud owner of a 2001 Ford Ranger 4x4 and
a 1970 Mach 1 351C @ http://community.webshots.com/album/18644819fHAehGJAjt
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