I couldn't find anybody on the net that ever reported this problem, or solved it, so it's most likely the unit has to be factory serviced.
Here's what another tech on FixYa suggests, and it may be your only recourse, short of just taking it apart and trying to clean and retighten connectors:
Go to; www.leica-camera.com. Leica is the maker of this rangefinder and they are very helpful in assisting their customers. You can also call them in N.J., at; 1-201-767-7500.
- Rank: Guru
- Rating: 92%, 95 Votes
Good luck :-)
This could be a major repair, so get an estimate first. Ebay sometimes has pretty good deals on these.
Good luck, and hope this helps.