I have been getting ctd randomly for sometime now after i installed dragonborn. I also updated my mods to fit into dragonborn. My patch is the latest 1.8

last time i only get ctd if i load a game after starting up skyrim. I do not get ctd if i load a game while playing the game. Now i get ctd randomly! E.g. i walk from npc A to npc B, bam ctd, but if i try a 2nd time i may not get a ctd.

i cleaned my masters using tes5edit, used boss and downloaded fixes.

The best and most fool-proof way is to disable half your mods, load a save, see if you still crash. If you do, try the other half. If you don't, cut the first half into half, and try. Keep going until you narrow it down.