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Something I see with my own scope is that the primary tilts a bit in its cell as the scope moves across the sky, due to the very "soft" mounting system I use. This means that it slowly points away from my guide scope even though the two are firmly bolted together.
So this or some form of tube flex might be the answer :-) It has to be something that causes the two scopes to drift apart in relation to each other, no doubt the guide scope is still doing it's job and keeping the guide star where it ought to be.
You can check this, watch your collimation carefully and see if it changes as the scopes drift apart. If you started off in perfect collimation, then recollimating should bring the two scopes back into alignment again.
cheers, Bird
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