I guess but I feel like this whole thing is a joke. Stop making ash piles?
No I am not joking at all I am serious. This problem has persisted since Fallout 3 the ash piles did the same thing in that game and caused crashes for me on that. It was the number one reason I did not use energy weapons and I loved energy weapons.
Now the issue is in Skyrim in TES my favorite game series. If they cannot fix an issue such as an ash pile they should remove it and just have zombies drop over. They could also have the wisp mothers just fade away.
Another reason I say remove them if they cannot fix them is that in Oblivion the ectoplasm faded out and in Skyrim and Fallout 3 and NV the problem just continues its very irritating. Now in Skyrim I avoid necromancers and playing as one. I also comb the land for the weapons and arrows left behind and sell those so there will be no issue with freezing and corrupted files.