Comfortable - But not that reliable

I've had this watch for a couple of years now. It is very comfortable due to its light weight. However, lately I have been having problems with it not keeping time. It seems to stop when I don't wear it for a day or so. Also the movable bezel gets stuck sometimes. I thought you didn't need to replace the battery, but I guess that is not the case....My wife also has an eco-drive and it does the same thing.....A beautiful watch that doesn't keep time...hmmmm