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I have ams700lgx and after sitting or diving for 1hr or more starts to inflate which can be a bit embarrassing. any suggestions on how to prevent it

No idea. My Titan has been doing that since 2008 - I just reach down and deflate it as needed. It's a nuisance but I've gotten used to it.

After deflating, pump the bulb once so you get the pop. That should help.