You say that you "lose the spark", ok, but why lie to your "brother-like friends"? If they're precious to you, tell them the truth, that you need a break, not some BS...
Now when the will to play again will return, things will have changed on the server you'll go, but you'll start a new project, a new adventure and you'll enjoy it. You mustn't fear the moment when the flame will go out, just play and enjoy the moment.
That's all for the psychologist's advices
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