Expired trading shares return to your cash balance, not your ewallet. So you can withdraw rather than reinvesting.
I have two trading shares expired and another expiring next week. The two that expired made ~97% and 99% respectively.
I ended up reinvesting the shares but if I had simply withdrawn them, I would have made a boatload of bitcoin without even counting my returns.
In mid december Bitcoin was over $900, last week under $400. (Well, not a boatload but x3 return on principal + x1 return of interest is nice anyway you slice it. =D)