What is your user custom settings (dial C1, C2, C3) and
Intended purpose ? Can share share for reference...
C1: normal use with flash, Av (lowest f), iso 800, flash hss auto sync, AI Focus, center point, matrix metering
C2: normal no flash, Av (lowest f), iso 1600, flash disabled IR assist only, AI Focus, center point, spot metering
C3: for anyone except myself, Av F4, iso 1600, flash hss 1/60-1/200sec, AI Servo, all points auto, matrix metering