Why did my AutoCPAP 90% pressure increase from baseline?

[Hojo]

From my bad (filter) experience, there wasn't a problem with pressure building up, the pressure couldn't be released and was giving me TOO much pressure.

The issue is when I exhale, the whole mask inflates as if my breathe has no where to go.  Is this what you had?  If so, did you just replace the filters more often or use it w/o the disposable filter?

That also could be a faulty machine.  

But, just to clarify, the machine will not relieve the pressure (unless you have EPR enabled).  What it will do is reduce the force of the air being shoved at you, so as to prevent the pressure from increasing as you breath out.

In my case, the machine was not faulty, just the filter not allowing proper air flow.  Once I changed back to the normal screen filter, all was (and is) well.