I manually adjust the ISO settings to the conditions in the room.... The darker the room the higher the ISO #/Setting... The more light the lower the number... In bright sunlight I use 100 as my ISO setting and when I am inside I use either 400 or 800 depending on how dark or light the room is.... Rarely use 1250, basically if it's pitch black in the room 1250 will give you a slightly better picture..
The auto settings on the EVO camera are not optimal... Test it the ISO settings a little and guess a little on the number vs lighting and you will get a good mix of results....