Well, I tested every level 70+ disc that I recently added to my server and none of them caused the crash for me. So, I am guessing it is something else. I am still leaning towards it being the source code or one of the custom changes I added in recently since I do run quite a few of them.
I will continue testing and see if I can come up with anything. So far, I tried reverting back to 1128 code version, but I also added in most of the features that have been added since then to it as well. Maybe it is one of those features that is causing the problem. The list of most of the added features I am currently using is:
Enraged, Flurry and Rampage Spamming Fix
http://www.eqemulator.net/forums/showthread.php?t=26258
Technique of Master Wu AA (Fix)
http://www.eqemulator.net/forums/showthread.php?t=26160
quest::traindiscs() and new quest::scribespells()
http://www.eqemulator.net/forums/showthread.php?t=26083
IP Limiting Additional Feature and Correction
http://www.eqemulator.net/forums/showthread.php?t=26122
#ItemLink <Item ID Number> (quest::itemlink())
http://www.eqemulator.net/forums/showthread.php?t=26018
Proc spells don't work after zoning (Proc Buff Fix)
http://www.eqemulator.net/forums/showthread.php?t=25991
New Quest Command quest::clearspawntimers()
http://www.eqemulator.net/forums/showthread.php?t=26261
Damage Bonus Functions (2H Bonus Fix)
http://www.eqemulator.net/forums/showthread.php?t=26262
Resurrection Reworked (with Confirmation box)
http://www.eqemulator.net/forums/showthread.php?t=26049
Buffs Being Blocked That Shouldn't Be (CHA Stacking Fix)
http://www.eqemulator.net/forums/showthread.php?t=25570
Spell Blocking (now with Intra-Zone restrictions!)
http://www.eqemulator.net/forums/showthread.php?t=26051
Spell And Skill Rule for Above MaxLevel Players
http://www.eqemulator.net/forums/showthread.php?t=25937