99 Caravan 3.3 starter not turning every time key is turned

I can try to start this thing up and I can hear a relay click and the fuel
pump running for a second, but the starter doesn't turn. I can bump it
several times and usually it will crank eventually, but today it took over
an hour to for my wife to get it started. Has anyone run across this with
the Caravan before? Only things I can think of is the starter is sticking
when it is in a certain rotational position, the contacts on the relay I'm
hearing are burnt, or maybe the key switch has a problem? Everything else
seems ok. Battery cranks the starter quickly. Lights, and all other bells
and whistles are bright so I don't believe its a battery problem. Acts like
a connection problem or a starter sticking. Any opinions are welcome. Thank
you in advance.
Brian