Hopefully some across this in future, I found the solution. I had the exact same issue with mine. I adjusted this little screw which changes the placement in the mirror, see picture below and solved the problem. To do it properly you would need to disassemble the whole camera, however I managed to do it with my girlfriends very thin and strong tweasers. (She wanted to murder me afterwards because apparently they were expensive and I blunted the ends by using them on metal, lol)
Anyway if you are adjusting them, if your camera focuses passed infinity, then you need to adjust this screw clockwise, however if you find your camera does not focus to infinity, then you need to twist it counterclockwise. Do not adjust it much as a small turn makes a huge difference. Also be aware that if you do chip of bits of the screw or the tweasers to clean them out before you action the camera as debris could damage the shutter ect. Also I tried turning it with pliers first to no success, you do not need much force to twist it but the tool you use must be very slim to fit between the screw and the side to manage to twist it.