Revo RMS oddities

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Have seen the RMS suddenly drop to zero a few times now, always when scootering in cold water.

Yesterday at 60m/200ft in 7c/44f on HMS Pathfinder. RMS dropped to zero for 10ish mins, jumping back up to 3h when stopped scootering and started the ascent.

Have never seen this when not scootering
 
Is it possible that there is a minimum heat level / gradient required for the RMS to make a prediction? And that the level of metabolism / heat generation while you are scootering is sometimes not enough to register enough in cold water to meet these minimums? Is there any link to changes in ambient temperature, such as descending into colder water? Perhaps exhaled gas gets cooled a lot more in the loop hose while scootering, on its way to the scrubbers? Which might suggest loop insulators.

Similar to the idea that we need to pre-breathe to "activate and warm up the scrubber"?
 
https://www.shearwater.com/products/peregrine/

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