Leaking rear grease seal will definitely create the condition you're describing. When grease gets on the rear shoes they will lock up, and skid the wheel that is leaking. It may very well be intermitent, and hard to duplicate.
My advice is to pull the brake drum, and look for contamination on the lining. Brake fluid can also cause this condition, but grease leaking is usually the problem.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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