More information is needed here.
Age of the snake?
Is it a pure diamond? If so what are your enclosure temps, cage size, amount of lighting? Is there a night drop and what is your heat source?
Soaking is usually a bad sign and can lead to other issues, and often points back to cage husbandry, specifically temps and overall humidity levels.
I assume having a diamond, you are aware of the different level of care they require compared to the other types of carpets?
See if you have the bases covered here:
http://www.reptilesmagazine.com/Snak...Python-Basics/
Scroll to the diamond section here:
http://www.southernxreptiles.com/Art...testing_lr.pdf
The second link mentions feeding and shedding issues that can occur without precise husbandry.
I hope after reading some of that, something pops and you can try to adjust.
If you've gone through all that and nobody here can help, it is time for a reptile vet.
Snakes take a long time to exhibit signs of illness, so when certain issues pop up they often stem from something that has been going on for an extended period.
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