SWIM is very concerned that Spice has taken a disliking towards him.
When SWIM first started experimenting with his self-extracted pure-white Spice, it was everything SWIM could have hoped and dreamed for and then some. Initial journeys were tentative, and with great respect towards the spice SWIM was nervous to experience a full breakthrough.

SWIM gently worked up towards larger doses, being forced to eye-out the amount as a scale is inaccessible.
Finally SWIM felt comfortable enough to attempt a breakthrough, and felt as though he should have as it was a large dose. SWIM was taken to a white "waiting room" and felt as though he was denied the breakthrough.
After this, SWIM queried Google and found that other voyagers had also been taken to this "waiting room" so while this was slightly disheartening, it was not defeating.

After this denial of hyperspace, SWIM waited two more days before attempting another voyage.
Here's where things get weird.
Now it seems as if the Spice doesn't like me anymore.
I no longer feel the Vibrations through my body, although the open-eye visuals are still equally intense. When SWIM closes his eyes the Sprites no longer seem to make themselves known to him either like they were before with much smaller doses.
Swim has attempted several times since then over the course of several days to experience the full Spice again, but the results are always the same.

Its almost as if SWIM has gotten used to the vibrations and doesn't feel them. Swim is worried

If it matters, the last time SWIM felt the very intense body load was coming off the peak of about a G of MDMA, which was a very, very pleasurable experience that brought SWIM veerrryyy close to liftoff. That was the voyage just before SWIM intentionally attempted the breakthrough.

Any thoughts? Has this happened to anyone or has anyone heard of this happening?

Try taking a break it can help a lot let you regather your thoughts about what you want from it, also don't try and force it good things take time and spice will still be there. My deepest journey's are usually when I'm not tying to break through it seems to know when I need to or when I'm ready and just takes me there.

Thankyou for replying. SWIM is about 2 days out from any attempt(apart from completing his 2nd extraction ) and planning on waiting at least 2 or 3 more days before attempting another journey.
Perhaps SWIM should try meditating for an hour beforehand next time? SWIM has never meditated on the journey before hand, although SWIM sort of prays to and thanks the spice for allowing him to experience the beauty and majesty allowed to the voyager.
But what to meditate on?

I don't mediate beforehand but truly believe set and setting alters the experience majorly. If I don't feel things are in order it reflects in the trip. I always tidy up, if I need to do something I'll always do it first etc. Guess it's just I got to feel relaxed beforehand.

Thanks for the advice! SWIM is very new to the Space and the more he learns the more he realizes he does not know.

Some good advise here . Take a break give it some time more than a few
Days . This is a common issue . I've experienced it .
Get things in better order . Resolve any unresolved issues in your life.
Minimize expectations when you do go back to the spice .
It's hard to know exactly why this happens .
Clarify your intentions .