P lace the tape on the reels in the oven and bring the oven slowly up to temperature.
Allow it to cool back to room temperature before removing the tape. I t is the moisture absorption that caused the problem, and to correct it, you have to drive off the moisture that accumulated. The oven technique is the fastest and probably the easiest way to do this. Handling is pretty much normal after the baking, and will probably last for some time until the tape accumulates enough moisture to go sticky again, whereupon re-baking will temporarily fix it again. The surface of the tape has become gummy and it sticks to the heads and fixed guides of the tape transport, squealing, jerking, and, in extreme cases, slowing down or stopping the tape transport.