Stepper driver warning: OTPW flag set

Hi All,

I have been getting this warning for stepper_z1 and stepper_z2 pop up anytime I activate my Z-motors.

"Stepper driver warning: OTPW flag set

The stepper driver 'stepper_z1' has triggered the OTPW flag and may stop working if it gets any hotter. This is an indication of an over temperature condition. This can be caused by a too high current. Please check the stepper driver settings and cooling."

Any thoughts on how to fix? I don't know how to change the current of the steppers.
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