Implant is hard and swollen overnight? (Photo)

I had a breast lift/ silicone implants done 3 years ago. Last August, I participated in a relay race and by the end of the weekend, my implant had moved up and was hard and swollen. I saw my ps and he said it was capsular contracture. My breast returned to normal two months later. This year, I did the relay again and same thing, my implant has moved up and is very hard and swollen. The day before it did this, I had some sharp, shooting pains underneath my armpit. What is causing this? Thank you.

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