Smartstart failing. Shuts off abruptly mid sleep.

Out of warranty. Exploring Diy repair possibilities.

It is harshly thunking off mid sleep. Wakes me up.

Also, doesn't start up promptly. Takes multiple really deep breaths to get it on.

I presume there is a sensor going bad or needs cleaning.

4 years 10 month old machine used daily. No repairs of any sort to date. Got it new.