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The only thing I can think of is if the axle seals are leaking a little bit on the rear drum brakes, and the grease is mixing with the brake dust that comes off the shoes. Occasionally this will create a sticky paste which usually causes the rears to lock up on light braking, but I think it would be possible also for it to cause a random lockup if the rears are adjusted too tight.
Also if a hold down spring or return spring on one of the shoes has come off or is weak that could cause it.
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