Symptom: When the machine is on but inactive without pressure but with residual airflow with mask on and attached to the hose there is a slight pulsing sensation on exhaling. The DME says that is normal and that is OK with me.
The Problem: However, during the night with mask at 15+cm pressure the "pulsing" becomes pronounced enought to wake me up. It is not continuous but occurs several times per minute in a random manner. While awake I observe the problem only when exhaling and still random. It feels like something "slapped" the hose (no I do not have a cat as the ResMed rep asked ). The effect is similiar to the inactive symptom described above but about 10 time more intense. if I put the machine in inactive mode and restart the problem seems to go away only to return sometime later and awaken me again. ( A new machines does this also)
The EPR is set to 3 full time. Works well for me but I suspect that this maybe the root of the problem. I plan to try EPR 2, 1 and off, but thought I would poll the forum to see if anyone has a had similar experience and hopefully knows a solution.