Ok guys here is the update,
both me and a team mate had the same problem, turns out there were 2 solutions, he hadnt re lubed his bolt ever...
which meant lube was the answer for his.
however mine, as helpfully pointed out by you guys, the fix was to take the frame off and remove the sear so that i could take the lube off the clip end
as far as i am aware all is good now, so the lesson was to ensure 0rings are properly lubed but make sure the bolt stays clean and no lube gets on the sear.
THANKS GUYS