Hello. I've been using a ResMed Air10 for about 6-7 years without issues. Last night, after it had running for about two minutes, it would start to blow much, much harder such that I could not exhale. Ramp time is set to 4, and smartstart is set to 'on'. The normal pressure that I use is around 4, and this increased pressure was around 14. I tried to stop and restart the machine several times, but the same thing happened each time. Has anyone ever had this issue of does anyone know how to fix this?