Your risk of developing capsular contracture again is approximately 50% if the same type of implant is placed in the same position.
If you have had a capsular contracture in the past, there is certainly a risk of developing another one. There are several different manuevers to help minimize this risk of recurrence.
The chance of you experiencing another complication after having waiting 2 years is small. Your skin flaps have revascularized and this fact alone decreases your chances of another complication. Revisit your reconstruction with your plastic surgeon, or visit with another if you desire.
Best of Luck
Things that can help reduce the risk of a capsule are the use a acellular dermal matrix products like Alloderm. Your surgeon can explain how these work. Using your own tissue, provided you are a candidate, is also an option. Meet with an experienced breast reconstruction surgeon, they can detail all of your options for you.
If you cam to me for a consult I would not recommend placement of expanders again. I don't know your age but I expect that you would like a procedure that will be durable over the rest of your life. Great options include using your lower abdominal tissue in the form of the DIEP flap or your inner thigh tissue, a PAP flap. The flaps and other tissue reconstructions are routinely performed in my practice and high extremely high patient satisfaction.
You are not wasting your time by trying again, but the risk of a recurrent contracture is probably higher given that it has happened once already. Revision may be done in a few ways, but none of them will guarantee a contracture will not recur. It is very reasonable to try and many women have obtained success after this sort of early setback.