I am hoping someone here might have a solution:
Morroblivion has been very stable, for me, until recently (3½ hours in). When approaching Mzuleft, I got a 100% crash while making way to the doors, leading to Mzuleft's interior. I left the area, waited 3 days, and was able to make it to the doors, and inside, though when I attempted to leave, I got a CTD (luckily, I saved just before exiting). I was able to exit Mzuleft after the reload. I found a netch in the lava, outside, and wonder if that could be related.
Another CTD area was the daedric ruins, near Punabi. After reloading, I steered clear of the area, until having to return for the Fighter's Guild quest, involving the orcs that inhabited the place, but had no CTD this time.
The last CTD I kept encountering was at the daedric ruins, north of Hla Oad. I would fast travel to the mines along the Odai River, to that area, from Wolverine Hall. I haven't even been to those ruins yet (or even Hla Oad, for that matter), so I don't know if it has to do with the corrupt spawn points I've read about. I tried waiting 3 days at that egg mine, but it crashed during the wait dialog, and I gave it a rest.
There is one idea that comes to mind though: creatures. Are the Morroblivion creature additions stable? If they aren't the case, then it must be the daedric / dwemer architecture, causing the crashes.
I use ENBoost, Purge Cell Buffers ++, 4gb Patch, far distance disabled, UOP, Morroblivion Fixes 1.8, etc.
I went into the Construction Set and began replacing Morroblivion creatures with Oblivion alternatives, but I'd rather not do all this if the creatures aren't the culprit.