Shutter will not fully open or close

Try using a can of compressed air on the shutter mechanism. You may have a piece of grit between the blades. Also whilst the camera is switched off you can gently move the shutter manually when you do and there's something stopping it you'll feel it. Move the shutter up and down quickly and the grit may fall out. Even a gentle tap with the camera upside down and the right way up may dislodge any dirt.
One of my customers had the audacity to put a dab of super glue on the shutter. He never had a half open shutter again. A bit drastic but it worked for him. He ended up fitting a UV filter to the lens and his lens is safe from damage or dirt.

BMW

wip it up side down and snap it a couple times put your finga on the round hole and blow through it then snap it again \.

da wipper snapper soultion

It sounds like the shutter mechanism is dirty, or you have a bad spring. Try taking it to a camera shop and have them clean it. It is not very expensive, and well worth it if it fixes the problem.

Best regards,
nightdiver

Let me know if it solves the problem.