ResMed S8 Vantage shuts off intermittantly

There is still power going to it, the LED displays no error. It will just turn off. It is from 2006, but not part of the recall. I am working with insurance now about a repair or replacement, but am nervous to not have a functioning machine. This is my lifeline. Has anyone experienced this before?

If I do get a replacement, should I ask for the same (or current similar model)? Or has something fantastic come on the market in the past 4 years? The features I like best are Autoset, data reading ability and humidifier. Wish list would be quieter, battery backup and HEPA filter. I have had great results with this machine (100% compliance) so don't want to go in a different direction.

Also, any new wonders in masks for mouth breathers? I have a Mirage full mask, and it's ok.