Why has this started again. i have had this today and a few guildys have, im not QQing im just saying so they can get an earlier start on their long term plans to fix this.

There is still a limit to how many instances can be run concurrently in order to avoid loss in performance on the instance servers. Improvements were made some months ago (as can be seen in this thread 01/10 Instance Capacity Update – Part II and others also). As has been said in above posts, great interest has been sparked once more with the introduction of new 5 man content as well as a new raid instance. We're aware of the message regarding 'additional instances' returning and we're keeping tabs on the situation.

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Q u o t e:
Why didn't you upgrade servers ahead of time?

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We've covered this many times before, it's not a case of just plugging in more 'stuff' and going "Hoorah, more instances can run now guys. Job done.". We wish it was that simple. The work we did recently that has improved the situation was a very complicated and fiercely delicate process that required a lot of realm downtime.

As said above, we're keeping tabs on this issue -- we're certainly not ignoring it.

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Q u o t e:
But why do we get dungeon deserter debuff when additional instance cant be launched??? or was it dungeon cooldown. Fix it please...

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We're looking into ways of improving the way the debuff is applied in cases where players have difficulty entering an instance. You should still be able to try and zone to the instance by clicking on the Dungeon Finder icon and selecting "Teleport to Instance" as I think someone mentioned earlier in the thread also.