Service Engine Soon light goes off on its own

2000 Maxima GXE

A couple months ago, I started the car and the "Service Engine Soon" light
stayed lit.  A few days later it turned off on its own.

Same thing happened this week.  I was going to take it to Nissan Service,
but the light shut off on its own.

To my understanding, once something happens twice in a row, the light it
supposed to stay lit until reset.  If the condition goes away two starts
in a row, should the light shut off?