Client just shuts down

[Morndenkainen]

[Sat Jun 12 17:22:31 2010] a wooly mammoth was hit by non-melee for 25 points of damage.
[Sat Jun 12 17:22:32 2010] a wooly mammoth was hit by non-melee for 26 points of damage.
[Sat Jun 12 17:22:33 2010] Taunting Attacker Master
[Sat Jun 12 17:22:33 2010] You begin casting Renew Summoning.
[Sat Jun 12 17:22:33 2010] a wooly mammoth was hit by non-melee for 26 points of damage.
[Sat Jun 12 17:22:35 2010] ERROR: String not found. (-2139324287)

Always seems to happen in combat, Im pretty sure I wasnt panning around, but here's the message I got from the log when it crashed... Anyone have any ideas here?

<edit>
Side note, this is the third time its happened today. I've been playing quite a while, and this is the most its ever happened before. Its quite rare that it happens to me, the only other times I can think of it happening seem to have been a few weeks ago. Also, if it happens again, I'll be sure to post the eqlog info for that too.

<edit>
Well, its almost a day later, and it hasnt happened since, and I've been logging the whole time... I dont understand what caused it... Funny that it happens so sporadically, I tink teh internetz jus haz a brian fahrt.