The problem is corrosion inside the chrome cap of a 2 piece lug nut. Probably caused by salt on the roads. Replace with 1 piece lug nuts and it won't happen again.
Thanks! I'll have to look into those. I got my second set from a Toyota dealer, hence why it happened again I assume.
I assume you have a torque wrench for those lug nuts? (80 ft/lbsi is pretty standard for Toyota sedans...100 ft/lbs for the bigger SUVs and Trucks.)
The 'again' has me wondering: were these Toyota lug nuts? Did you have Toyota lug nuts before the prior replacement? Was the prior replacement for swelling, or some other reason? I've experienced lug nuts swelling, but I think more of my experience of that sort has been with cheaper aftermarket ones. I don't think I've run into it with the ones from Toyota.
Massive respect for those that land on the 'farms. During a spring Middies cruise I was in the O-club one night with a bunch of young pilots who were going out for their carrier quals the next day. Watched as one didn't make it on takeoff. Not a pretty feeling. Watching their practice landings at Pensacola on solid ground is so much different than on board even in relatively calm seas.