Hey. I think that was a bug on drivers/or my cpu management. Because also i had lower score fps in this test gpu test 2 time spy,because intel boost was not working fine on this test.
So i use in Windows Management.HIGH PERFORMANCE and boost 4.7ghz always , no gpu load drop and no crashing,no bsod and score are fine. Also tested on 3third driver ( 416.94 ) and its fine.
Test now smooth like hell,no hitching,no drops,score fine,no crashing:)
So ok. 417.71 and 416.94 tested no issues.