Definitely sounds like something that needs professional repair. Not sure what this camera is worth so it might not make sense to send it out. You might look into another camera from around that same era. I lent my old Nikkormat to my daughter about 6 or 7 years ago and she has kept it for herself. I miss this simple camera so I decided to pick one up on ebay. I picked up a well worn black example (I love the brass showing) for $65 but haven't received it yet. There were tons of them there most under $100 and many come with the 50mm lens for the same price.