********* and misleading practice

I bought the instant pot pro and tried the sous vede . After three attempts the water stays on pre heat for over three hours. The recomemded waiting time is 20 to 40 minutes.. I sent it back. Its a week now and most of my e mails go unaddressed. On further investigation it seems to be a common problem. The sous vede in most models is misleading and does not work.. instant pot sous vede function on most pots is a lie.