I've only been using a device since last November (2016) but will share my observation: I was given a ResMed mask at first which was hard on my twice broken nose but my wife said I did not snore at all. They switched me to an Amara View Full Face Mask by Philips Respironics which was much easier on my nose since it doesn't impact the bridge of your nose; however, in about a weeks time I was snoring again and my AHI numbers climbed. I switched back to the mask and my wife says no more snoring and my numbers are coming back down again. I believe there is a correlation between snoring and apneas. I'd ask your Dr why the change if all that is different is the machine?