Replying to Sigma 35mm 1.4 W/ MC-11 Autofocus

So I've had my Sigma 35mm 1.4 with the MC-11 Sony E mount adapter for almost two years now on my Sony a7, and in the past year or so it seems as if the autofocus has just started going to shit, and really just the lens's sharpness in general when shooting at F/2.8 and larger. I take care of my glass and clean it regularly, I don't know what it is. Do I need to update the software or fine tune the autofocus (if it even works like that)? I'm not very techy with softwares or cameras outside of the editing and resolution side of things. Also, has anyone else experienced poor autofocus and sharpness with this same setup?