Focusing trouble- M.Zuiko Digital ED 12-40mm f/2.8 PRO Lens

My Olympus M.Zuiko Digital ED 12-40mm f/2.8 PRO lens is no longer focusing properly. I cannot get images to be in focus even when using manual mode. In AF modes, the camera responds normally (I see the green rectangles indicating where the camera is focusing) but the image never gets sharp. The problem is most obvious at longer focal lengths. The problem persists in all shooting modes and apertures.

The lens has worked great since I got it a few months ago.

The camera I use it with is the E-M1 mark ii. Both camera and lens have newest firmware.

My other lenses are working normally.

Wondering if anyone has any ideas? I've tried everything I can think of.

Thanks in advance.