FFA AI issues

I'm having issues when playing VS AI on Free-For-All.
The AI (playing RG burn Ramp) will consistently target my low board impact creatures (Such as a fog bank) with removal, instead of the other AI's beefy-creatures, such as siege rhino, and others.
It feels as though the AI's will focus-fire me until I'm dead, instead of changing focus to whoever has the most board presence, or most threatening at the time.
The AI (playing RG burn Ramp) will consistently target my low board impact creatures (Such as a fog bank) with removal, instead of the other AI's beefy-creatures, such as siege rhino, and others.
It feels as though the AI's will focus-fire me until I'm dead, instead of changing focus to whoever has the most board presence, or most threatening at the time.