You need to make a run over the entire car looking for little things like that which vibrate loose. You might want to remove that bolt, scrape any oxidation off the connector, and where it connects to, then smear a little dielectric grease on it. You might also want to check these two threads where eensy-weensy-tiny-loose bolts stranded me once and forced me to limp home on the other. I'd check both of them if I were you.
Clutch Set Screw:
Ehhrggg, Standed by a Set-Screw
Shifter Bolt:
Dang--1, 3, and 5 Gone... and I'm out in Bumf***