I've been having issues with the shutter times on my Pentax 67. I first noticed the problem during a night shoot that required bulb (B) exposures. The shutter wouldn't stay open and shut after what felt like 1 second. Now, after dry firing the camera a few dozen times I've realized the problem is more severe since all shutter times will only work correctly sometimes but usually default to something that feels and sounds like a 500th or 1000th. Long shutter times like 1/4, 1/2 or 1 second work sometimes but are usually way too short.

Has anyone had this problem? Is it possibly a weak battery or will it require expensive repairs?

thanks,
Max