I have a leupold laser range finder that the red led readout has become unreadable on. Leupold offered me a new model at a significant discount but seemed to indicate that all laser rangefinders eventually become unreadable. I was wondering what everyone's experience is on this. I think I have had the range finder for maybe 6 or 7 years. Do all rangefinders quit working after a certain lifespan even if they are infrequently used and stored properly?