Mine did this as well, i played with all the settings and now it works
without any issues and i am running with the eco off and the leaf on.
Maybe it just needs to learn the house at least that is what i believe
happened. Mine is working just fine no...
I just noticed this same issue yesterday. Fan never shuts off unless i
pull nest from the wall and turn off the breaker. Checked all settings,
wires, i have had it for two months, so upsetting, going to have to send
it back.