You're not alone with this issue. I've been stuck myself with the Christmas Spirit appearing and disappearing the last couple of days. When it appears it won't let me complete it and when it disappears it won't let me start a new adventure as it registers that the Christmas spirit hasn't been completed and tells me to wait awhile before starting a new adventure. Can' move forward with the next part of the xmas challenge and can't complete the current challenge so stuck in limbo.