I would suggest to activate the DRO, since you are shooting JPG all the time. On the upper knob (left side) there is an inscription D-R, just turn the knob on it and push on the Fn button which is situated in the middle of the same knob. On the screen you will see 3 modes (Off, D-R and D-R+). Try the third one. It'll help you a lot.
Good luck and happy shooting.