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not sure which system one you're talking about, but mine doesn't raise pressure every 10 minutes. my minimum is 8.5 with a maximum of 12. i rarely rise to 12 and usually stay 8.5 to 10 or 11. here is a pressure graph where it stayed at minimum pressure for an hour at one point. i have many examples of straight lines well over 10 minutes. i have firmware v250.robysue wrote: The System One's pressure increases are not dramatically fast. And that means they are less likely to wake you up. And they're less likely to trigger a leak. But that hunt-and-peck algorithm is constantly kicking in. And so every 10 minutes or so there is a pressure increase. And that's enough to bother some people. But that hunt-and-peck algorithm is also going to help keep the machine from decreasing the pressure below a therapeutic level when the min pressure setting is set too low: Once the pressure is suboptimal, the subtle differences in the wave flow combined with the hunt-and-peck algorithm will prevent the machine from further decreasing the pressure much of the time.