I would agree that it is uncommon problem. In looking at your pictures, and by your description, I would say that your belly problem is largely from laxity of the abdominal wall. Usually if the sutures aren't holding, there is a specific area of weakness as most of us place multiple sutures to repair the muscle rather than one continuous to avoid this problem. The fact that you "bulge on the side" may mean that your diastasis repair (tightening the muscles in the midline) is holding up but the outer wall is weak and left uncorrected. This would be a rare occurrence; however, it may benefit from mesh support (much like a hernia). I would proceed with caution if you choose this route as this can be a large, unpredictable event and a difficult problem to correct.
Regarding the breast, it appears as though your implants are "bottoming out" somewhat early. This may be corrected by reducing the areola and reinforcing the internal capsule, possibly with mesh or other substances, to help keep the implants in correct position.
With any plastic surgery there comes an element of unpredictability. However, I would talk this over with your surgeon and make a definitive plan that you both feel comfortable with before proceeding with any more revisions. I wish you the best.