What could be causing pain around the top portion of my subfascial silicone implant?

I have Subfascial silicone breast implants and am all of a sudden having a severe stretching pain when I reach up high over head on one side. Or use that arm to push off of a surface or do something like open a jar. The pain is only around the top of the implant. I can’t seem to find any information online about what could be causing this since my implants are not under the middle.