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Quirky Apple ][ keyboard behavior



I've got a '78 model Apple ][.  After a while, the keyboard (or
whatever controls it) will decide on different letter for certain
keys.  For example, "HOME" will become "HKIA."  The errors are
consistent (i.e. "HOME" *always* becomes "HKIA"); if I wiggle the
circuit board beneath the keyboard a little, the problem goes away. 
This isn't a really serious problem, only something that happens every
half-hour to an hour or so, but it does mean I can't put much on top
of the system since I keep having to wiggle the keyboard.  Any
suggestions on causes and permanent fixes?