At 139,000 miles my transmission lost torque while driving,like I was in neutral

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My OD / OFF light had been flashing for a couple weeks, I noticed hard shifting when it was. I had to be towed home. The next morning all seemed ok, good torque reverse and forward, then it slipped away after warming up. I wound up pulling transmission fuse under the hood and reinstalling it, I had forward and reverse again but it shortly slipped away. Could this be an electronic problem?