When mine behaved like this, I reset the program and set back to 12 hr function, same problem a day later, like your case.
Then I found a broken o-ring on pre filter tray. restored to normal after I changed all the seals. Mine is 3+ yrs old. Working fine now.
Since yours is 10month old I dont think it seals problem.
I am also curious to know any other reasons...
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