You usually get what you pay for. Unfortunately, trail cameras are not like bows, where nearly everything on the market is good. I've seen half as many wild game cameras work well, as the ones that work poorly. But it seems like the ones that work well, work well for a long time. The bad ones are wrong from the getgo.
I have 2 friends with wildgame cameras, and they describe the same issue with them as you do.
We use bushnell's and scoutguards, and I've only had one issue with 4 of them, but it only happened once in 3 years.