The DME has stated that if the problem recurs they will swap out the unit. Last night, the machine malfunctioned again so I used a backup (PRS1 760). I won't be able to return the machine until the REMWorks DME opens Monday.
Mostly just want to document this malfunction here in case anyone else experiences it. It makes breathing difficult and you can actually watch the displayed pressure hang at EPAPmax and it goes to IPAP max only if you suck hard, so there is no pressure support. Also a low volume high pitched whistle from the machine that is not normally there.