I keep losing them. I got a brand new one (3rd for my D7100) and I was shocked (and a little friggin ticked off...) that it jumped off my camera within an hour. Granted, I did a 4.1 mile hike with the camera slung over my shoulder, but the feeling of having a “complete” camera lasting only an hour made me feel a little...used... I vowed never to buy another eyecup. Do you guys ever lose them as easily as I do? Do you bother replacing them?