Various Duty instance > only after boss fights complete
ie; had Haukke HM > i locked up on Halicarnassus.
saw other char's leave the boss room, i could click, type, move via keyboard.
it occured in other instances a swell

Server Sargatanas
OS Win7 64bit.
RAM 16Gb DDR3 1600
Nvidia GTX750 current drivers
ISP Shaw Cable 30Mbps DL

i scanned for viruses (incl safemode), cleaned temp files, rebooted computer, modem, router, speedtest shows fine. no bluescreens lockups in other programs, games, videos, etc.