Are you even listening to this thread???   The feature is OFF. I repeat is OFF.  And it is still sending reminders. Why are you telling people the solution is to turn it off reminders when the whole point of the thread is that the OFF feature doesn't work. 

In fact, when we found it ON - something QBO turned on itself because we certainly never turned it on after using the program for years and years. Suddenly we start getting raging emails from clients. The only solution was to remove everyone's email address so QBO couldn't send anything.