I had a set of the 888 versions mine mostly turned while going over rough sections like rock's i had lost about an inch of travel the time i got down. to stop it from doing this i took off the twisty bit which underneath is the air valve and wrapped electricians tape around the o ring. so it kinda act'd like a bigger tighter o ring. then simply put it back on sometimes it might a bit of the rubber mallet to it to put it in propally, don't worry its dead easy to remove you simply put a small flat head screw driver underneath and  lever it up. problem solved the bodge way. I'm sure there a real way to stop it without using tape but that's the way i stopped it.

Heres an e-mail i got back on how to solve the issue.

First, remove the ATA cap.

2nd, using a Shimano cassette tool unscrew the top of the cartridge.

3rd, compress the fork a little to expose the side of the cartridge.

4th, on the side of the cartridge you will notice a grub screw (in the plugs thread).

5th, turn the grub screw 1/4 turn clockwise.

Re fit the plug and test the ATA function - you may have to repeat this process to fine tune it?

Had exactly the same problem on my glory, spoke to windwave and they recommended the grub screw method described above. Do them up nice and tight and you'll have no worries - mine have been fine since although you can't wind your travel down once you've tightened them (not that you'd want to on a glory!!!!!) A real strange spec choice in my opinion on an eight inch travel frame - giant must have got a job lot cheap!!!

Sweet, thanks for the help.