Guild Wars 2

I have been having this problem on and off since I installed GW2 about a month and a half ago. Typically it will crash out of the game, and if I try to re-start, the crashing-out becomes more frequent. A re-boot of the machine though, will enable me to play for hours on end with no issues. After a few days of evening play, it will crash. I put my machine to sleep in between play time. I can play other games for hours/days on end with no issues.

I have run Memtest 86 overnight and found no memory issues.

Win 7 x64
GTX 560 Ti (306.02)
Core i5 3550
16 GB Patriot 1600MHz
Gigabyte UD5H Mobo
System in on a SSD, but GW2 is on a HDD

Attached in my analyze file.

Thanks in advance for any help!