I have had a couple Moultries the old I series was always noted to have a problem with the display (that and a very slow trigger but the new ones are much better). I got about 5 years out of my I40 and the I65 has been running about 3 years but tends to miss a few pics.
My thoughts would be to start switching to Covert cameras, the MP6 and Red40 are both outstanding cameras, the MP6 Black and Black60 are very nice if you want black flash that can't be seen past about a foot and still have good flash range. Battery life on these cameras is outstanding.