will not render, keeps failling at different spots.

i've spent of today trying project render on new computer. (i7 5820, 64gb ram, gtx970)

 

i'm used vids failing - in same spot.  1 fail after few seconds or render 12 mins, 14 mins , fail.  have tried rendering in media encoder, direct premiere.  i've ditched cache files, i've imported sequence want render new project, , tried rendering that.  i've been through , removed few things know premiere stuggles (like time reversed clip).  of stuff left stuff used render time on old system: 4k files resized on timeline, lots of effects , transitions.  keep getting unknown error.   have tried rendering out section fails (at around 80%) , rendered fine.  did complete once there 1 file (a 4k timelapse shot), in nested sequence had time remapping on on sequence, went black in middle of render.  on checking timeline same glitch present.  apply time remapping clip inside nested sequence , work ok, needed time remapping on sequence. cludged one.

 

its inconsistency thats got me scratching head:  can that?  point hardware issue?

 

i'm using windows 10 recent cc build (41 think: zig zag)

for purposes of testing, edit project settings , set gpu acceleration software only.  try exporting problematic piece , report thanks.

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