1990 toyota corolla transmisson issue

#1
My Toyota corolla has the 3sp trans in it. I recently was driving down the hi way and the trans all of a sudden acted as though you shifted it into neutral. So I pulled over and tried all gears even reverse and the car acted as though it was in neutral. I let the car sit for a min then started it back up then the trans shifted fine again. I drove another 8 miles then it did the same thing. The fluid is fine and the cars temp is fine. Any help or ideas?
 
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