Hi there,
I don't mean to be rude, but if the camera is doing this with all your lenses, then the first thing to look at is your technique.
When focusing, do you pay attention to which of the AF points the camera is choosing? If the point it uses as priority isn't over your subject then obv the subject won't be in focus. You can choose to use just the centre AF point. It may be worth trying this for a while so you are sure exactly which part of the frame will be in focus, ie always the centre. Otherwise, just pay attention to which of the AF points goes red when the focussed 'beep' goes o