Track seized

This weekend we had one of the sled's track seize up while going about 20mph. First time happening and we didn't have a crazy carpet so we pull the track side up onto another sled and towed it back to the truck that way. We took it slow and stopped often so we didn't fry the belt on the towing sled but when we got to the bottom we stopped to let the belt chill and when we went to start the tow sled its track was also seized. When pulling on the original seized sled (purple) onto the trailer the track unlocked and began running like normal again so that's a plus. But now we have to figure out what we did to the towing sled (red) on the way down. Any info would help! Thanks guys

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Track seized