Guild Wars 2

After the last update ( Build: Gw2 69,744) game client start crashing each 5-10 minutes.
It just turn screen black with only graphic cursor visible and background music/ambient effects playing. It crashes with any graphic settings from very low to max and in all places – HoT maps, vanilla GW2 maps, personal instances. Just when i tried to gather my resource nodes in Divinity Reach i crashed 4 times in a 10 minutes.
It is possible to close client either by alt-f4 or alt-tabbing and close from taskbar.
I use 64 bit client with latest video drivers for Geforce gtx 980Ti. I run repair option for a .dat file too.
Before last update (including Ep3 and 3 first updates with fixes) game client work flawless and last crashes i remember was at HoT launch before 64 bit client was introduced.
But last 4th update fix that was up yesterday broke something and now it is constant crashfest.