Hey there, thanks for all the info!

My wizard x220 is having an issue. Once I arm it and give it a small amount of throttle, motors 1 3 and 4 spool up to full throttle, while motor 2 remains at idle.

When I give it full throttle, all motors spool up to full throttle and then motor 2 winds down to idle.

Can you point me in the right direction on fixing this issue?

Double check to make sure there are solid connections from the motors to esc's and to the rest of the quad. Could be a loose solder joint.

Is this happening with props on or on the bench?
If it is able to maintain stable hover, don't worry. Just test carefully