What is the main reason more patients than not end up getting their lip implants removed?

In the last three years the my filler dissolves within weeks. I have tried juvaderm, restylane, and rha. Since august I have had six syringes and its virtually gone after a month each time. I have tried different injectors. I am told based on my size I would not be a great candidate for a fat transfer so I'm considering a lip lift or lip lift with implants. What is the main reason more patients than not end up getting their implants removed? I find twice as many removal reviews.