I have an issue in Firelands when trying to solo Alysrazor. Once the encounter starts and I get the feather and get airborne and fly through fiery rings/hoops, out of blue I drop down to the ground and I only missed 1 ring while flying. Am I doing something wrong? When I drop to the ground I instantly die of course...
I had this issue on my warrior. I've found the solution to be to take 2 feathers, then wait for alys to stop dropping feathers and begin flying normally, then take the third and do the fight as normal. If I don't do that, sometimes the boss will insta-despawn, or what has been happening to you happens. Also, don't fly too high to get rings, that caused the boss to despawn for me too