semi final of 8us mara, 3-0 up the guy leaves and i get logged out nothing to do with my connection which is fine and i get dq, shouldnt i get the default win if he leaves even if i do get logged out????

GAME: 2hot2pot has left the game
GAME: liam__scfc can play on until finish of break, at that point a default win is awarded
You have been logged out, either your internet connection has gone down, is too busy or a network fault has occurred.

If the game officially finished between your opponent leaving and you leaving then yes you would go through. However, If you don't get back onto the game server by the time the next round starts then you would be disqualified which is why this may of happened.

As to the way you were logged out, I'm not sure but it looks like the other semi final was played and completed with no problems.

i went back online to watch the other semi they were at 2-2 when i got logged out, happens quite alot recently getting logged out for no reason, when my connection is fine most of the time like it was today

Well that looks strange... Marathon semis are first to 4, so after the guy left, you should have been let play on to win that game (which it seems you did), then given the match, with the next frame showing up in the results. Looks as though you unfortunately got disconnected before the match was seen to end by the server, if that makes sense.

By the way, if you had stayed online, and then had been offline in time for the final, you'd see your score appear in the semi-final match on the tournament page http://www.funkypool.com/tournaments/53029 but the final would be there too, and it would be BYE-DQ to _deja_vu_.