First I had the OM4, then the OM-4Ti. Still do. I have worked with them in the middle of OZ in the summer, and here in Holland in the freezing cold. Never had a problem in that respect. However, when living in very humid conditions the OM4Ti bodies began giving me problems, such as the electronics failing to start up, or the electronics going dead in the middle of shooting . . . after some fiddling I get them to work again, but I have numerous "blank" shots . . . Now I have been back for some years in a non humid envirement, my remaining OM4Ti body has no problems . . .
You have put in fresh batteries, I suppose? What is the problem?