Very strange feeling when I bend over, implant getting stuck to something - what could this be?

I have had my implants for over 10 years now. They are silicone and put under the muscle. Everything seemed to go beautifully. One very strange thing that I noticed a couple months after the surgery is when I bent over specifically in the shower to shave my legs, a feeling of my left implant getting stuck to something occurred. I am assuming this would have happened immediately. I was just pretty cautious with my movements for a while because of the surgery. Anyhow, this would continue happening throughout the years, but it seemed that if I kept my back very straight while bending over and not slouch, it would not happen. Fast-forward to now which is over 10 years later, it’s happening all of the time and not just in the shower. They started about six months ago. At first, I didn’t even put two and two together. I thought there was something wrong with my heart. Through much testing on my heart, my heart is just fine and that is not the problem. This brings me to realizing that this all started after I got my breast implants well over 10 years ago and things are now getting much more frequent and worse. What could this be is the implant getting stuck on a rib or something? I get regular mammograms which my implants are moved around, etc. So it’s not like it is stuck all of the time. Please help this is very weird and getting scary!!