Since the patch introducing the Lost Shores, my game is experiencing serious crash/game client freeze too. About every 25-30 minutes actually.
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Device Description : NVIDIA GeForce GTX 260
Adapter String : GeForce GTX 260
BIOS String : Version 62.00.4C.00.01
Chip Type : GeForce GTX 260
DAC Type : Integrated RAMDAC
Driver Date : 2012/10/02
Driver Version : 9.18.13.697
Driver Provider : NVIDIA
Memory Size : 896 MB