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I ended up reinvesting the shares but if I had simply withdrawn them, I would have made a boatload of bitcoin without even counting my returns.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)