Put it on wander or whip it.. if not it's probs stuck in the floor. Whistle it and lead it to DEEP water. I killed a titan once and my gigga sank under the map till I couldn't see it I whistled it and led to the ocean. Hope this helps.
Wyvern wing gust, diplo, paracer platform with ramps, quetzal platform with ramps. You have to whistle follow on lowest follow and use the ramp as a snap point for it to "snap onto" and walk out if the mesh/ground/foundation trust happens almost daily here